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.