Active vs Passive Air Purification: What 20 Years of IAQ Work in Singapore Actually Teaches You6/28/2026
After 20 years and more than 1,000 client organisations across Singapore and Southeast Asia, ProMedUSA explains why active Glass DBD bipolar ionisation outperforms passive HEPA filtration for commercial spaces — and when each technology has its proper place.
Twenty years ago, when ProMedUSA started deploying air quality solutions in Singapore's hotels, hospitals, and commercial facilities, the conversation was mostly about filtration. HEPA was the gold standard. If you had a HEPA unit in the room, you had air purification covered.
What two decades of measured outcomes taught us — using calibrated instruments, not intuition — is that the type of purification matters as much as the specification. And the type that consistently outperforms in Singapore's sealed, air-conditioned commercial environment is active, not passive. Passive purification waits for pollutants to come to the machine. Active Glass DBD bipolar ionisation goes to the pollutants — throughout the entire space, including every surface — and it does so safely, continuously, and without ozone. The Fundamental Limitation of Passive Filtration
A HEPA filter is a physical barrier. Air passes through it. Particles get trapped. It's reliable and well-understood.
The problem is the word 'passes.' The filter only treats air that reaches it. In Singapore's large, sealed, air-conditioned commercial spaces: • Air in far corners may take hours to circulate past the filter — if it ever does • Surfaces — walls, curtains, carpets, aircon vents — are completely unaffected • VOCs pass through HEPA media almost entirely unimpeded • Mould growing inside an aircon duct gets distributed throughout the room — the HEPA unit captures some spores but doesn't address the source • Hotel rooms turning over in 25 minutes don't give a HEPA unit enough time to process the entire room volume These aren't flaws in HEPA as a technology. They're the physics of how passive filtration works. The machine can only clean what comes to it. Why Glass DBD Bipolar Ionisation Works Differently — and Why the Design Matters
PurAire Glass DBD Cold Plasma bipolar ionisation generates positive and negative oxygen ions continuously and releases them into the entire room — not waiting for air to come to the unit.
The physics of why this works — and why it's safe — is worth understanding. Not All Bipolar Ionisation Is the Same — Why the Technology Design Matters
This is where most articles miss the point entirely. 'Bipolar ionisation' is not a single technology. It's a category — and the design underneath it makes all the difference.
How Glass DBD Cold Plasma Works
DBD stands for Dielectric Barrier Discharge. In PurAire's Glass DBD systems, an alternating current (AC) voltage is applied across two electrodes separated by a glass dielectric barrier. That barrier acts like a capacitor — it caps the current and prevents harsh electrical arcs. Instead, it creates millions of evenly distributed micro-discharges across the surface.
As the AC cycle alternates between positive and negative voltages, air molecules passing through the plasma field simultaneously gain and lose electrons — producing a naturally balanced 1:1 ratio of positive and negative oxygen ions. No engineering tricks required. It's inherent to the physics of how DBD works. Because the discharge is distributed evenly — not concentrated at a single point — there are no localised high-energy hotspots. That's the reason Glass DBD produces virtually no ozone. The thermal conditions that would split O2 molecules into atomic oxygen simply don't occur. How Corona Discharge Ionisation Works — and Why It's Different
Corona discharge uses a high-voltage current applied to a sharp conductive tip — a needle, carbon fibre emitter, or tungsten point. The concentrated electrical field around that tip creates a localised plasma plume.
Here's the critical problem: if the system uses direct current (DC), it produces only one polarity of ions — positive or negative, not both. That's not true bipolar ionisation at all. To produce genuine bipolar output from corona discharge, manufacturers must either use AC on a single needle or pair separate positive and negative needle arrays — a specific engineering choice that many cheaper units simply don't make. More importantly, the intense localised energy at a corona needle tip creates the high-temperature conditions that split O2 molecules — generating ozone as a byproduct. As needle tips age, oxidise, and accumulate deposits, voltage regulation becomes inconsistent and ozone output can spike unpredictably. Glass DBD is inherently bipolar, inherently low-ozone, and inherently stable. Corona discharge can be engineered to approach that standard — but it requires specific design choices, and many commercial units don't make them. UL 2998 certification is the independent proof of which category a product actually falls into. What 8 Years of Singapore Deployments Shows
ProMedUSA added certified PurAire Glass DBD bipolar ionisation to our portfolio in 2017 — after the technology and UL 2998 independent certification met our standards for recommendation. Since then, we've measured real-world outcomes using calibrated instruments:
• Mould counts reduced measurably in hotels and clinics within weeks of installation • VOC levels in newly renovated spaces drop significantly within days • Persistent odours — cigarette smoke, cooking, mildew — eliminated at source, not masked • Guest satisfaction scores improve when bipolar ionisation is part of the room package These outcomes are measured with the Atmocube IAQ monitor — tracking 12 parameters including CO2, PM2.5, VOCs, temperature, and humidity — and the Aeroqual S500 ozone sensor to NEA and EPA standards. Field results in actual Singapore properties, not laboratory conditions. Science and certification together confirm the technology and our products are safe and beneficial. Eight years of Singapore field results back that up. Active vs Passive: Direct Comparison
Active vs passive air purification — how PurAire Glass DBD bipolar ionisation compares to standard HEPA filtration across every key performance criterion.
ProMedUSA's IAQ Evolution — 20 Years, Three Technologies
ProMedUSA has been Singapore's trusted IAQ provider since 2006. That history breaks down clearly:
•2006 — Professional UV ozone generators for deep odour removal and surface disinfection in unoccupied commercial spaces •2010 — Expanded into air purification solutions for occupied spaces •2017 — Added certified PurAire Glass DBD bipolar ionisation after the technology and UL 2998 independent certification met our standards for recommendation Eight years of bipolar ionisation deployments. Twenty years of IAQ expertise. We added bipolar ionisation to our portfolio because the science was solid, the certification was independent, and the results were measurable — not because it was fashionable. When Each Technology Is the Right Choice
After 20 years and more than 1,000 client organisations across Singapore and Southeast Asia, our honest position:
• HEPA filtration: excellent supplementary particle capture, effective in small well-ventilated spaces, appropriate alongside active systems for comprehensive coverage • PurAire Glass DBD bipolar ionisation (fixed, wall-mounted, in-duct): primary IAQ management for occupied commercial spaces — hotels, clinics, offices, facilities — where 24/7 active treatment of air and surfaces is the requirement • ProMedUSA UV ozone generators: deep treatment of unoccupied spaces — vacant hotel rooms, bin centres, garbage rooms, vehicles — where high-concentration ozone eliminates heavy odours and disinfects surfaces before re-occupancy The right technology matched to the actual problem. That's the approach that produces results you can measure rather than specifications that look impressive on paper. Frequently Asked QuestionsQ. Why doesn't a HEPA air purifier clean the whole room?
Because it only treats air that physically passes through its filter. Air in corners, near ceilings, behind furniture, and on surfaces doesn't necessarily reach the filter — particularly in Singapore's large, sealed, air-conditioned commercial spaces. Active Glass DBD bipolar ionisation sends ions to the pollutants rather than waiting for them to arrive
Q. How does ProMedUSA measure real-world air quality improvement?
We use calibrated instruments including the Atmocube IAQ monitor — measuring 12 critical parameters including CO2, PM2.5, VOCs, temperature, and humidity — and the Aeroqual S500 ozone sensor meeting NEA and EPA standards. Pre and post-installation measurement is available on request for clients who want documented evidence of air quality improvement.
Q. Why is Glass DBD bipolar ionisation safer than corona discharge designs?
Glass DBD distributes the electrical discharge evenly across a dielectric surface — no localised high-energy hotspots, so no ozone-generating conditions. Corona discharge concentrates energy at a needle tip, creating thermal conditions that split O2 molecules into ozone, especially as tips degrade. Glass DBD is inherently safer by design, and UL 2998 certification independently verifies the zero-ozone result.
Q. Is active bipolar ionisation better than passive HEPA for Singapore hotels?
For primary IAQ management in Singapore's sealed, air-conditioned hotel environment — yes. HEPA cannot treat surfaces, cannot reach areas without air circulation, and cannot keep pace with rapid room turnovers. PurAire Glass DBD active bipolar ionisation treats the entire room including surfaces from the moment it's running, achieving measurable improvement within minutes.
Q. How long has ProMedUSA been in the Singapore IAQ industry?
Since 2006 — 20 years across three complementary technologies. UV ozone generators from 2006, air purification solutions from 2010, and certified PurAire Glass DBD bipolar ionisation from 2017.
Trusted by more than 1,000 hotels, resorts, hospitals, government facilities, and commercial organisations across Singapore, Southeast Asia and the Middle East. The Bottom Line
Passive filtration does what it says. It filters the air that comes to it.
Active Glass DBD bipolar ionisation does something different: it goes to the air, and to every surface in the space. In Singapore's commercial and hospitality environment, that difference is measurable. We've been measuring it since 2017.
Is Bipolar Ionisation Safe? Glass DBD Technology and UL 2998 Explained | ProMedUSA Singapore
Learn more....Is bipolar ionisation safe? ProMedUSA has 20 years of IAQ experience and 8 years of certified Glass DBD bipolar ionisation deployments across Singapore. Here is what the technology, the science, and the independent certification actually show.
There's a narrative gaining traction online: that all ionisers, plasma devices, and bipolar ionisation systems are unsafe for occupied spaces.
ProMedUSA has been Singapore's trusted indoor air quality provider since 2006 — UV ozone generators from the start, air purification solutions from 2010, and certified PurAire Glass DBD bipolar ionisation added in 2017. Eight years of measured bipolar ionisation deployments across hotels, hospitals, clinics, and commercial facilities. We've seen what works and what doesn't. We measure outcomes with calibrated instruments. And we think the current narrative around bipolar ionisation safety is missing the most important distinction: it's not one technology. Certified Glass DBD Cold Plasma bipolar ionisation is safe for continuous 24/7 use in occupied spaces. The physics of the design, 263 peer-reviewed studies, and independent UL 2998 certification all confirm it. The Most Important Distinction Nobody's Making
When an article warns that 'bipolar ionisation may produce ozone,' it may be making an accurate statement about certain ionisation designs.
But it becomes dangerously misleading when applied to all bipolar ionisation systems regardless of technology or certification. The technology behind the device determines whether ozone is produced. And the independent certification determines whether you can trust the manufacturer's claim about it. Not All Bipolar Ionisation Is the Same — Why the Technology Design Matters
This is where most articles miss the point entirely. 'Bipolar ionisation' is not a single technology. It's a category — and the design underneath it makes all the difference.
How Glass DBD Cold Plasma Works
DBD stands for Dielectric Barrier Discharge. In PurAire's Glass DBD systems, an alternating current (AC) voltage is applied across two electrodes separated by a glass dielectric barrier. That barrier acts like a capacitor — it caps the current and prevents harsh electrical arcs. Instead, it creates millions of evenly distributed micro-discharges across the surface.
As the AC cycle alternates between positive and negative voltages, air molecules passing through the plasma field simultaneously gain and lose electrons — producing a naturally balanced 1:1 ratio of positive and negative oxygen ions. No engineering tricks required. It's inherent to the physics of how DBD works. Because the discharge is distributed evenly — not concentrated at a single point — there are no localised high-energy hotspots. That's the reason Glass DBD produces virtually no ozone. The thermal conditions that would split O2 molecules into atomic oxygen simply don't occur. How Corona Discharge Ionisation Works — and Why It's Different
Corona discharge uses a high-voltage current applied to a sharp conductive tip — a needle, carbon fibre emitter, or tungsten point. The concentrated electrical field around that tip creates a localised plasma plume.
Here's the critical problem: if the system uses direct current (DC), it produces only one polarity of ions — positive or negative, not both. That's not true bipolar ionisation at all. To produce genuine bipolar output from corona discharge, manufacturers must either use AC on a single needle or pair separate positive and negative needle arrays — a specific engineering choice that many cheaper units simply don't make. More importantly, the intense localised energy at a corona needle tip creates the high-temperature conditions that split O2 molecules — generating ozone as a byproduct. As needle tips age, oxidise, and accumulate deposits, voltage regulation becomes inconsistent and ozone output can spike unpredictably. Glass DBD is inherently bipolar, inherently low-ozone, and inherently stable. Corona discharge can be engineered to approach that standard — but it requires specific design choices, and many commercial units don't make them. UL 2998 certification is the independent proof of which category a product actually falls into. The Independent "Gold" Standard: UL 2998
UL 2998 exists precisely because not all ionisation devices perform as marketed. It's independent third-party testing by Underwriters Laboratories — a device must emit less than 0.005 ppm of ozone under real-world operating conditions to earn certification.
•Ten times stricter than the older UL 867 standard (0.050 ppm) •Ten times stricter than the US FDA limit for medical devices (0.050 ppm) •Below quantifiable detection levels for standard ozone testing •Product-specific — each individual model tested independently, not the brand The US EPA states clearly: if you choose bipolar ionisation, choose a device certified to UL 2998. PurAire's fixed, wall-mounted, and in-duct Glass DBD range meets that standard on every model. The EPA doesn't say avoid bipolar ionisation. What 263 Peer-Reviewed Studies Show
The Jiang et al. review examined 263 peer-reviewed research papers on bipolar ionisation. No evidence of harm to humans. Published studies additionally show negative ions actively benefit memory, cognition, and alertness.
Certified bipolar ionisation also: •Neutralises airborne bacteria, viruses, mould spores, and allergens •Breaks down VOCs from furniture, adhesives, carpets, and building materials •Agglomerates fine particles so they fall out of the breathing zone •Reduces surface contamination — not just airborne pollutants Peer-reviewed research found no evidence air ionisation harms humans. Published studies show negative ions actively benefit human memory, cognition, and alertness. Our certified products produce only ions — not ozone, not byproducts. PurAire Glass DBD vs Standard HEPA Air Purifier
PurAire Glass DBD bipolar ionisation vs a standard HEPA air purifier — a side-by-side comparison of what each technology can and cannot do.
ProMedUSA's IAQ Evolution — 20 Years, Three Technologies
ProMedUSA has been Singapore's trusted IAQ provider since 2006. That history breaks down clearly:
•2006 — Professional UV ozone generators for deep odour removal and surface disinfection in unoccupied commercial spaces •2010 — Expanded into air purification solutions for occupied spaces •2017 — Added certified PurAire Glass DBD bipolar ionisation after the technology and UL 2998 independent certification met our standards for recommendation Eight years of bipolar ionisation deployments. Twenty years of IAQ expertise. We added bipolar ionisation to our portfolio because the science was solid, the certification was independent, and the results were measurable — not because it was fashionable. Transparency: The Full ProMedUSA Technology Picture
ProMedUSA covers three complementary IAQ technologies. Each is chosen for a specific application — and we're straight about what each does.
•PurAire fixed, wall-mounted, and in-duct Glass DBD bipolar ionisers — UL 2998 and UL 867 certified. Continuous 24/7 operation in occupied spaces. Hotels, hospitals, clinics, offices, commercial facilities. •PurAire AirPro-MAX and PurAire DUO portable units — not UL 2998 certified. Produce a very, very small amount of ozone at the output nozzle. In normal room conditions with air circulation, the ozone quickly disperses to virtually unmeasurable levels (as tested by TUV). Used daily by housekeepers across Singapore and Southeast Asia for rapid room freshening. •ProMedUSA UV ozone generators — deliberately produce ozone for deep treatment of unoccupied spaces: bin centres, vacant hotel rooms, garbage rooms, vehicles. Powerful, proven, and used correctly with vacated spaces and natural ozone dissipation before re-entry. The right technology for the right application. That's how ProMedUSA has built trust with more than 45 organisations across Singapore. Frequently Asked QuestionsQ. Is bipolar ionisation safe for occupied spaces in Singapore?
Yes — when using Glass DBD technology certified to UL 2998. PurAire's fixed, wall-mounted, and in-duct Glass DBD range is independently verified to emit less than 0.005 ppm of ozone under real-world conditions (UL2998). These systems have been running continuously in Singapore commercial spaces since 2017
Q. What is the difference between Glass DBD and corona discharge ionisation?
Glass DBD uses an AC voltage across a glass dielectric barrier to create evenly distributed micro-discharges, producing inherently balanced 1:1 bipolar ions with virtually no ozone. Corona discharge concentrates high-voltage energy at a needle tip — creating ozone-generating conditions and often producing only single-polarity ions. Glass DBD is more stable, more consistently bipolar, and inherently safer by design.
Q. Does PurAire's bipolar ionisation produce ozone?
Some ionisation designs do — particularly those using corona discharge needle tips where localised high energy can split O2 molecules.
PurAire Glass DBD Cold Plasma is a fundamentally different design. The distributed discharge across the dielectric surface prevents those conditions. UL 2998 certification independently verifies the result: less than 0.005 ppm — effectively zero. Q. What does the EPA say about bipolar ionisation?
The US EPA states: if you choose bipolar ionisation technology, use a device that meets UL 2998 standard certification.
PurAire's fixed range is certified to UL 2998 on every individual model — not the brand as a whole, but each specific product. Q. How long has ProMedUSA been deploying bipolar ionisation in Singapore?
Since 2017 — eight years of certified Glass DBD bipolar ionisation deployments across hotels, hospitals, clinics, and commercial facilities. ProMedUSA's broader IAQ history spans 20 years: UV ozone generators from 2006, air purification from 2010, and bipolar ionisation added in 2017 when the technology and independent certification met our standards for recommendation.
The Bottom Line
Certified Glass DBD bipolar ionisation is safe. Not because we say so — because the physics of the design says so, independent certification confirms it, and 263 peer-reviewed studies agree.
Choose technology that's been independently verified. Demand UL 2998 certification. Ask what type of ionisation design is underneath the marketing. Those are the questions that separate genuinely safe, effective products from those that merely claim to be.
Talk to us about the right IAQ solution for
your property. The SG-OzPAK Portable Ozonated Water Jet Spray That's Changing How Housekeeping Teams Clean Toilets and Bathrooms
The SG-OzPAK: a compact sling-bag ozonated water jet spray system weighing less than 1.5kg, battery powered, ready to use anywhere in a hotel or commercial facility. The SG-OzPAK runs on rechargeable battery, and generates ozonated water on demand from any tap.
Discover how the SG-OzPAK portable ozonated water jet spray helps hotel housekeeping teams and commercial cleaners eliminate urine odours, remove tough toilet stains, and reduce harsh chemical use — backed by real Singapore field data.
If you've spent any time managing a hotel housekeeping operation or running a commercial cleaning contract, you already know that restrooms are where products either prove their worth or expose their limitations. Chemical cleaners get used in volume, cleaning staff deal with fumes and skin irritation shift after shift, and yet — somehow — that persistent background smell of urine returns within hours of the bathroom being serviced.
The SG-OzPAK is designed to change that dynamic. A compact, portable ozonated water jet spray system purpose-built for professional cleaning teams, it generates fresh ozonated water on-demand at the point of use — giving housekeepers and cleaning contractors a powerful, chemical-free solution that goes to work where conventional products fall short. Why Toilet and Bathroom Cleaning Remains One of the Hardest Jobs in the Building
The problems that make restroom cleaning genuinely difficult aren't always visible. Urine contains uric acid crystals that penetrate grout lines, adhere to the base of toilet pedestals, and build up in floor drains. Once embedded, these crystals are largely unaffected by standard disinfectants. Heat and humidity — both standard features of any occupied bathroom — reactivate them, causing the odour to return even after a thorough clean.
Hard water compounds the challenge. Mineral deposits from calcium and magnesium leave limescale rings inside toilet bowls, around taps and showerheads, and across tile surfaces. These not only look unsightly but create rough, porous surfaces that trap bacteria and organic matter, making future cleaning more difficult. For hotels in particular, the stakes are high. Industry research confirms that cleanliness is the single biggest driver of hotel guest satisfaction — and that bathroom conditions are consistently the area most likely to generate a negative review. Industry data shows 80% of hotels are currently operating with understaffed housekeeping teams, yet guest expectations around cleanliness are at an all-time high. Cleaning efficiency isn't optional — it's operationally essential. How the SG-OzPAK Works
The SG-OzPAK uses electrolytic ozone generation to convert ordinary tap water into dissolved ozonated water at the point of use. There are no chemicals to mix, no concentrate cartridges to replace, and no mains power required — the unit runs on a rechargeable 12V battery. A member of your cleaning team connects to any tap or water source, squeezes the jespray's trigger to activate the ozone generation cycle, and instantly has a powerful pressurised jet of fresh ozonated water ready for application.
Ozone (O₃) is a naturally occurring oxidising agent. When dissolved in water at the right concentration, it reacts directly with organic compounds — breaking down uric acid, neutralising odour-causing bacteria, and lifting biofilm from grout and porous surfaces — without leaving chemical residue behind. After the job is done, the solution simply reverts to oxygen and water.
Technical Specifications:
Portable, Flexible, and Ready for the Realities of Daily Operations
Traditional ozonated water systems are often fixed installations plumbed into a central point — workable for large facilities with a dedicated cleaning room, but impractical for hotel housekeeping teams moving from floor to floor.
The SG-OzPAK is worn as a sling bag across the body, weighing less than 2kg fully loaded. It travels on a housekeeping round, fits in a cleaning caddy, or can be carried by hand to wherever it's needed — guest bathrooms, public restrooms, bin centres, gym changing rooms, staff facilities, and back-of-house areas. Real-World Application: How Housekeeping Teams Use SG-OzPAK Every DayScenario 1: Guest Room Bathroom Turnover
A housekeeper arrives at a checkout room. The toilet bowl has a limescale ring and a faint urine smell. Rather than reaching for a bottle of acid-based limescale remover and a separate deodorising spray, she connects the SG-OzPAK to the bathroom tap, activates the unit, and applies the ozonated jet directly to the bowl, the underside of the rim, and the grout at the base of the pedestal. She moves on to make the bed and clean the rest of the room. When she returns, she wipes down and flushes. No residual smell. No chemical film. Ready for the next guest.
Scenario 2: Public Restroom Maintenance — Hotel Lobby or Mall
The lobby restrooms see constant footfall throughout the day. On the midday round, one cubicle has a urine smell that wasn't there this morning. Using the SG-OzPAK, the facilities team member treats the floor drain, the grout lines around the toilet base, and the seat. The ozonated water eliminates the odour-causing compounds rather than masking them. The evening check comes back clean.
Scenario 3: Bin Centre and Rubbish Chute Treatment
SG-OzPAK in action at a commercial bin centre — the jet spray penetrates floor drains and wall surfaces where odour-causing bacteria and organic waste accumulate. SG-OzPAK deployed at a Singapore hotel bin centre — ozonated water jet spray targets drains, floor surfaces, and bin exteriors where odour compounds accumulate.
Bin centres and rubbish chutes are among the most challenging odour environments in any hotel or commercial property.
The combination of organic waste, warmth, and humidity creates conditions where conventional cleaning products provide only temporary relief. The SG-OzPAK's jet spray delivers ozonated water directly into drains, onto bin exteriors, and across floor surfaces — eliminating dirt, odour-causing bacteria and organic residue at the source. And the Ozonated water requires no rinsing. Field results from Singapore hotel deployments show measurable and sustained odour reduction after each treatment cycle.
Watch: SG-OzPAK in action at a Singapore hotel bin centre and Shopping Centre Toilet
SG-OzPAK deployed at a 5-Star Singapore hotel's bin centre and shopping centre toilet — ozonated water jet spray treatment of bin centre floor drains and surfaces. No chemicals. No PPE. No residue.
Scenario 4: MRT Stations, Food Centres, and High-Traffic Public Toilets
The SG-OzPAK was developed specifically for the demands of Singapore's high-footfall public facilities. Field tests conducted at locations including Little India MRT Station, Bukit Timah Food Centre, and Berseh Food Centre — measured using Cosmos XP-329 odour meters and SystemSure Plus ATP monitors — demonstrated consistent, significant reductions in both odour levels and bacterial contamination after treatment.
SG-OzPAk Proven Results Chart Field-tested results: odour and ATP bacteria swab readings before and after SG-OzPAK ozonated water treatment at three Singapore public restroom locations. 
Independent field test results: before and after odour readings (Cosmos XP-329) and ATP bacteria swab tests (SystemSure Plus) at three Singapore public toilet locations. Bacteria reduced from 5,272 RLU to just 20 RLU at Little India MRT Station.
Worker Safety: The MSDS Rating That Speaks for Itself
One of the most common concerns when introducing a new cleaning technology is worker safety. For ozonated water at the concentrations generated by the SG-OzPAK, the answer is unambiguous — and independently certified...The absolute safest classification possible. No PPE required. No gloves, goggles, or ventilation requirements. Safe on skin, safe around food, safe around guests.
No PPE is required. No COSHH data sheet to manage. No fume risk in enclosed restroom environments. For cleaning staff who spend their shifts in spaces where conventional chemical use can cause cumulative respiratory and skin effects, this represents a genuine improvement in daily working conditions.
Labour Savings and Operational Efficiency
When cleaning products work properly, teams work faster. One of the most time-consuming aspects of restroom cleaning or bin centre cleaning is re-cleaning — returning to an area that looked clean but smelled wrong, or addressing a complaint that came in thirty minutes after the housekeeper or building engineer left the room or bin centre. When ozonated water eliminates odours at the source rather than masking them, re-cleaning rates drop. And, there's no rinsing required.
For a hotel running a hundred or more guest rooms, reducing even one re-clean per twenty rooms per day or a bin centre, produces a meaningful reduction in labour hours over the course of a month. For commercial cleaning contractors managing multiple client sites, the efficiency gains compound across the portfolio. Chemical Reduction, Sustainability, ESG, and Workplace Health
The shift away from harsh chemical cleaning products is no longer purely an environmental preference — it is becoming a procurement and tender requirement. Hotel brands with corporate sustainability commitments, healthcare facilities with occupant health obligations, and educational institutions with duty-of-care responsibilities are all increasingly specifying reduced-chemical or chemical-free cleaning programs.
The SG-OzPAK directly supports these goals. Ozonated water cleans and deodorises without any chemicals — no concentrate procurement, no plastic packaging, no chemical runoff. The solution reverts to plain tap water and oxygen after use, leaving surfaces clean without environmental trace and without wasting water in rinsing. For operators reporting against ESG frameworks, the ability to demonstrate a measurable reduction in chemical use across restroom cleaning operations is a tangible and reportable outcome. Trusted by Singapore's Leading Facilities Operators
SG-OzPAK is trusted by some of Singapore's most demanding facility operators — from integrated resorts and international hotel brands to national healthcare groups, government agencies, and major commercial property owners. Here is a selection of Singapore organisations actively using SG-OzPAK ozonated water technology across their facilities operations.
More than 45 Singapore organisations across hospitality, healthcare, retail, transport, government, and education trust SG-OzPAK for their facilities cleaning operations.
From Marina Bay Sands and Fairmont Hotels to the National Environment Agency's hawker centre programme, SMRT train stations, and major retail destinations including Suntec City, Northpoint City, and Westgate — SG-OzPAK has proven itself in the most demanding cleaning environments Singapore has to offer. Frequently Asked QuestionsQ. How does the SG-OzPAK differ from a conventional mop-and-bucket cleaning system?
The SG-OzPAK is a jet spray system — it is not designed for use in mop buckets or spray bottles. It delivers a pressurised stream of ozonated water directly onto target surfaces: toilet bowls, grout lines, floor drains, bin interiors, and hard surfaces. This makes it particularly effective for treating the specific areas — drains, grout, pedestal bases — where uric acid and organic waste accumulate and odours originate.
Q. Does ozonated water actually remove hard water stains from toilets?
Ozonated water is highly effective at breaking down the organic biofilm and bacteria that accumulate alongside mineral deposits, and it eliminates the odour compounds that co-exist with limescale. For visible limescale, the jet action combined with ozonated water typically produces noticeably better results than chemical spray-and-wipe approaches, particularly in grout and around rim edges.
Q. How long does the ozonated solution remain active?
The SG-OzPAK generates ozonated water at the point of application — it is not stored in a container and used later. This on-demand generation ensures the water applied to the surface is always fresh and fully active. Dissolved ozone reverts to oxygen relatively quickly, which is precisely why point-of-use generation is the correct approach for professional cleaning.
Q. Is it safe for housekeeping staff to handle?
Yes. The SG-OzPAK carries an MSDS/HMIS safety rating of 0-0-0-0. No PPE is required and there is no COSHH classification to manage. Compared to the acid-based or bleach-containing cleaners it replaces, it represents a significant improvement in occupational safety. It's as safe as plain tap water - so safe you cabn even wash with it and drink it.
Q. What ongoing costs are involved?
The primary ongoing costs are electricity for battery charging and tap water. There are no chemical consumables, no cartridges, and no concentrate replenishment costs. Total cost of ownership is substantially lower over time than maintaining a chemical cleaning programme for the same applications.
Q. Can it be used in food preparation areas or kitchens?
Ozonated water is widely used in food hygiene applications globally. Ozonated Water is FDA, USDA and AVA approved for use.
Talk to Our Team About SG-OzPAK for Your Operation
Whether you manage housekeeping across a single hotel property, run a multi-site commercial cleaning contract, or are responsible for facilities across a corporate campus, the SG-OzPAK delivers measurable results in restroom cleaning quality, bin centre odour control, worker safety, and chemical reduction.
Get in touch with the ProMedUSA team to discuss your specific cleaning challenges, request a product demonstration, or arrange a trial at your facility. Contact us today via WhatsApp at +65 9456 8313 — or send us a message to book a no obligation demonstration. Cleaner restrooms, no chemicals, and a safer environment for your team — in a sling bag that weighs less than 1.5kg. Learn why and how Tersano Stabilized Aqueous Ozone (SAO) is transforming hotel and resort housekeeping across Singapore and Southeast Asia -- and why your chemical program may already be obsolete.  Tersano SAO in action at an international airport -- cleaning carpets and soft surfaces using nothing but water, electricity and oxygen. The average hotel housekeeping storeroom contains 15 to 30 different chemical cleaning products. Each one needs its own training protocol, storage requirements, hazard label, and disposal procedure. What if you could replace most of them with a single solution rated completely safe -- MSDS 0-0-0-0 -- made entirely from tap water? That is not a hypothetical. It is what Tersano Stabilized Aqueous Ozone (SAO) does, every day, in over 8,000 organisations worldwide -- from five-star hotels and international airport terminals to hospitals, commercial buildings, and resort properties across Southeast Asia. ProMedUSA has been Singapore's authorized Tersano dealer for eight years. In that time, we have helped hotels, resorts, hospitals and facilities management companies across Singapore and the region dismantle chemical cleaning programmes that no longer needed to exist. This post explains exactly how -- and why general managers, executive housekeepers, and facilities managers are making the switch and not looking back. The Problem Nobody Talks About: What Is Actually In That Storeroom A typical hotel chemical dispensing room -- multiple products, dilution systems, warning signs, PPE requirements, and ongoing cost. Tersano replaces most of this with one wall-mounted unit and a tap. Walk into any hotel housekeeping storeroom and you will find something that looks like the photograph above -- a wall of dispensing cartridges, rows of multi-litre chemical drums in every colour, laminated warning charts, and stacks of spray bottles filled with a different chemical for every surface. Behind that visual complexity sits a chain of real operational costs that most general managers have simply accepted as unavoidable.
 The typical hotel housekeeping trolley: multiple chemical products for different surfaces. With Tersano SAO, a single spray bottle filled from the Lotus Pro V9 replaces most of them. What Is Tersano SAO -- and How Does It Work? The Tersano Lotus Pro V9 -- wall-mounted, plumbed directly to a cold water supply. Turn it on, fill your bottle, clean. That is the entire process. Tersano SAO -- Stabilized Aqueous Ozone -- is created by infusing ordinary cold tap water with ozone using a proprietary, patented electrolytic process. The Lotus Pro V9 is wall-mounted in your housekeeping area and plumbed to a cold water line. Staff fill their spray bottles directly from it. No mixing. No measuring. No PPE. No hazard labels. No chemical drums to store or dispose of. The result is a powerful, broad-spectrum cleaning and sanitizing solution that is:
 So Safe, You Can Wash Your Face With It James Lim from ProMedUSA washing his face directly with freshly generated Tersano SAO. An MSDS 0-0-0-0 rating is not a marketing claim -- it is a fact we demonstrate every single day. We do not ask our clients to take our word for the safety of Tersano SAO. We demonstrate it. The photograph above was taken during a client site visit -- I filled a bottle directly from the Lotus Pro unit and washed my face with it to show the housekeeping team exactly what MSDS 0-0-0-0 means in practice. "If I would not put it on my own face, I would not ask your team to spray it around guests, staff, or food preparation areas. With Tersano SAO, I can -- and do -- demonstrate that every time." -- James Lim, ProMedUSA Pte Ltd Compare that to the warning labels, glove requirements, and ventilation instructions on virtually every conventional cleaning product in your current storeroom. The contrast is stark -- and telling. Proven Results: The Numbers Do Not Lie ATP bioluminescence test on a hospital ward room's toilet seat: 3,394 RLU before cleaning -- 158 RLU after a single wipe with Tersano SAO. A reduction of over 95%. No chemicals used The before-and-after ATP test shown above was conducted using a Kikkoman Lumitester Smart bioluminescence meter -- the industry standard for surface hygiene measurement. The result: a reduction from 3,394 RLU to 158 RLU -- more than 95% -- with a single wipe using a cloth dampened with Tersano SAO. No chemical disinfectant. No rinsing. No residue left behind. The Chemical-Free Carpet RevolutionSoft surfaces are where traditional chemical programmes fail most visibly -- and where Tersano SAO delivers some of its most dramatic results.  One Product Replaces Most of What Is In Your Storeroom Certified by the World's Most Trusted Bodies Tersano SAO holds certifications from Green Seal, LEED, NSF, TUV SUD, HACCP International, USDA, FDA, Kosher, Halal, BOMA BEST, EcoVadis Silver 2023, US EPA and GECA Australia. Tersano SAO is one of the most independently certified cleaning systems in the world. If your hotel operates under LEED, BOMA BEST, Green Seal, or any ESG sustainability reporting standard, Tersano SAO actively supports and evidences your certification claims:
The Real Cost of Doing Nothing Every jug, container or drum of cleaning chemical your property consumes becomes part of this. Tersano SAO generates zero chemical waste and zero packaging waste -- only water. Every 1 litre jug, every 5-litre drum of bathroom disinfectant, every dilution cartridge, every spray bottle of glass cleaner -- all of it ends up in the waste stream. With growing regulatory pressure on chemical waste disposal and single-use plastic packaging across Southeast Asia, this is an exposure that forward-thinking hotels are already working to reduce. Tersano SAO generates zero chemical waste and zero packaging waste. The only consumable is the SAO cartridge. When SAO has done its job, it simply returns to being water. Nothing enters the drain that was not already there. 75% of travellers globally now say they prefer to stay at eco-friendly, sustainable hotels. Your housekeeping chemistry programme is either supporting or undermining that preference -- every single day. Simple Enough for Any Housekeeping Team to Use ImmediatelySwitching cleaning systems sounds like re-training an entire team, updating SOPs, and managing a complex transition. In practice, Tersano SAO dramatically reduces training complexity:
Singapore's Most Experienced Authorized Tersano Dealer -- 8 Years of ExperienceProMedUSA Pte Ltd has been the most experienced authorized Tersano dealer in Singapore since 2018. We have supplied and commissioned Tersano SAO systems in hotels, hospitals, commercial buildings, schools, food and beverage operations, and facilities management companies across Singapore and Southeast Asia. We do not just sell the unit. We conduct demonstrations, manage installation, train your team, and provide ongoing support for the life of the system. When you work with us, you work with people who know Tersano SAO thoroughly -- because we have been living with it, and showing it to clients, for nearly a decade. Frequently Asked QuestionsQ. What is Tersano SAO and how does it work?A. Tersano SAO (Stabilized Aqueous Ozone) is produced by the Lotus Pro V9, which passes cold tap water through a patented electrolytic cell, infusing it with ozone. The resulting solution is a powerful cleaner, sanitizer, deodorizer and VOC eliminator with no added chemistry. After use, it simply reverts to plain water. Q. Is Tersano SAO safe for hotel staff and guests?A. Yes -- completely. Tersano SAO carries an MSDS rating of 0-0-0-0, the safest possible classification. No PPE, gloves, eye protection, ventilation requirements, or hazard signage needed. Safe around guests, safe around food contact surfaces, and safe on skin. Q. What cleaning chemicals can Tersano SAO replace?A. Tersano SAO replaces most daily-use hotel cleaning products including glass cleaners, surface sanitizers, bathroom disinfectants, carpet cleaners and deodorizers, stainless steel cleaners, food contact surface sanitizers, fabric refreshers, and general-purpose multi-surface cleaners. Q. Does SAO work on carpets and soft furnishings?A. YES! And, very effectively. Because SAO contains no surfactants, it leaves no sticky residue in carpet fibres -- the primary cause of rapid re-soiling with conventional carpet shampoos. Carpets dry faster, resist re-soiling, and retain their appearance longer. Q. What certifications does Tersano hold?A. Green Seal, LEED (USGBC), NSF, TUV SUD, HACCP International, BOMA BEST, EcoVadis Silver 2023, US EPA, USDA, FDA, Kosher, Etimad Halal, and GECA Australia. One of the most comprehensively certified cleaning systems available anywhere in the world. Q. Where can I get Tersano SAO in Singapore?A. ProMedUSA Pte Ltd is Singapore's most experienced authorized Tersano dealer with eight years of experience. We supply, install and support Tersano SAO systems across Singapore and Southeast Asia. Q. How and Where to use Tersano? Tersano stabilized aqueous osmotic water can be used in everything from a spray bottle to a fogger to a robot. Ready to See What SAO Can Do for Your Property?We offer on-site demonstrations at your property. Bring us your most challenging surface, your dirtiest carpet, your most odour-affected room. We will show you exactly what Tersano SAO does and let the results speak for themselves. Eight years. Thousands of litres of SAO deployed across Singapore and Southeast Asia. Zero regrets from any client who made the switch. ProMedUSA Pte Ltd / 111 North Bridge Road, #08-27 Peninsula Plaza, Singapore 179098 | Tel: (65) 6836-9665 | WhatsApp: +65 9456 8313 | [email protected]
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AuthorWritten by James Lim, Indoor Air Quality Specialist with 20+ years of experience in odour removal, bipolar ionisation, hospitality IAQ, and commercial air purification systems throughout Singapore and Southeast Asia. |
