Wahoo Pool Aquatics

Technical Engineering

UV vs Ozone vs Chlorine: Commercial Sanitisation Systems Compared

Three sanitisation technologies dominate commercial aquatic water treatment. Each has specific strengths by facility type, bather load, and operating cost.

Wahoo Principal Engineer · Principal Engineer & Director10 February 20266 min read

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Water TreatmentSanitisationUVOzoneChlorine

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Water quality defines commercial aquatic facility success. Poor sanitisation drives chloramine build-up, air-quality issues for indoor pools, user skin and eye irritation, and — at worst — health-department closure. The three dominant sanitisation systems — chlorine, UV, and ozone — each carry specific advantages. Most premium commercial vessels today combine two or all three.

Chlorine: The Baseline

Chlorine remains the default primary sanitiser across Australian commercial pools because of its residual effect — chlorine continues protecting water after application, giving baseline sanitisation between filtration cycles.

The downside: at high bather loads, chlorine combines with organic contaminants (sweat, skin cells) to form chloramines, which cause the classic 'pool smell' and respiratory irritation. Indoor commercial pools with high bather density suffer the most.

UV: Destroying Chloramines

UV sanitisation uses high-intensity ultraviolet light to destroy chloramines and disinfectant-resistant pathogens (Cryptosporidium, Giardia) that standard chlorination struggles with. UV is a secondary treatment — it doesn't leave a residual, so chlorine is still required.

The killer application is indoor aquatic centres: UV destroys chloramines before they can off-gas into the breathing air, dramatically reducing the characteristic chlorine smell and improving indoor air quality for swimmers and staff.

Ozone: The Premium Option

Ozone is the most potent commercial sanitiser — it destroys organic matter before it has a chance to combine with chlorine, meaning dramatically lower chloramine formation in the first place. It's also highly effective against pathogens.

The trade-off: ozone systems carry the highest capital cost (specialised generation plant, safety interlocks, degassing chambers) and require careful engineering to prevent ozone escape into occupied spaces. Typically deployed on premium hotel pools, spas, and hydrotherapy vessels.

What We Recommend by Facility Type

By facility:

  • 50m municipal lap pools: Chlorine + UV (chloramine destruction critical for competition athletes)
  • Learn-to-swim programme pools: Chlorine + UV (high bather density, indoor air quality)
  • Hydrotherapy vessels at 34°C: Chlorine + Ozone (elevated temperatures accelerate contaminant breakdown; ozone clinical-grade purity)
  • Boutique hotel pools: Chlorine + Ozone (premium guest experience, minimal smell)
  • Outdoor resort lagoons: Chlorine-only typically sufficient (UV degradation natural, air quality less constrained)

Conclusion

System selection is project-specific. Our water treatment design at Stage 02 assesses bather load, facility type, indoor/outdoor positioning, and target user experience to specify the optimal combination.

Next Steps

Thinking about a project like this?

What is involved in building a rooftop or high-rise pool?

Four constraints dominate. Structural: transfer-slab loading and lateral wind shear at height, which is why the design starts with structural modelling rather than a shape. Acoustic: plant-room vibration must be isolated from the tenancy below, usually with neoprene and epoxy isolation detailing. Waterproofing: a failure over occupied floors is catastrophic, so membranes are fully bonded and commercial-rated rather than domestic. Logistics: every cubic metre of concrete and every plant item is a crane movement inside someone else's programme. We have delivered rooftop vessels on towers above 30 storeys.

How do you construct the pool shell?

A monolithic shotcrete shell, poured as a single continuous operation to eliminate cold joints and substrate weakness — the industry best practice at commercial scale. That is followed by a fully bonded commercial-grade waterproofing membrane, then commercial ceramics or epoxy grouts set to tolerance. On competition vessels the tile setting is surveyed with laser theodolite during the shoot and the finish, because dimensional accuracy has to survive tiling rather than merely exist in the concrete.

How is filtration sized for a commercial pool?

By bather load and statutory turnover, not by vessel volume alone. We design turnovers as short as 30 minutes for high-load facilities such as learn-to-swim and splash play, using sand or glass media, ultra-fine filtration, and UV or ozone sanitisation as the duty requires. Undersized plant rooms and residential-grade pumps are one of the most common causes of forced operational closure in commercial facilities, so the plant room is sized for the busiest realistic day rather than the average.

How much does a commercial swimming pool cost in Australia?

Commercial aquatic construction is highly variable, but the bands we routinely deliver are a useful anchor: from about $500K for a standalone commercial vessel, $2–5M for a high-rise podium or rooftop pool, and $7–9M for a municipal aquatic centre with competition and secondary vessels. What moves the number is structural complexity (ground-level versus a 40th-floor transfer slab), geotechnical conditions, plant sizing for bather load, compliance overlay such as DDA or heritage, and finish specification. We price after engineering, not before, so the figure you receive is the figure the site supports. Send plans through the quote form for a tailored estimate.

How do I get a quote from Wahoo Pool Aquatics?

Two routes. Call 1300 924 666 and speak to the commercial estimation team directly, Monday to Friday 7am–5pm AEST. Or submit a brief through the quote form with your service type, location, project stage and timeline — we respond within 24 hours, an NDA is available on request, and a tailored proposal follows once we have plans. Either route reaches the same estimation team; the phone is faster if you have a tender date.

More detail in all answers, or call 1300 924 666 and speak to the estimation team.

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