Ultraviolet light destroys free chlorine. Cyanuric acid binds loosely to chlorine and shields it from UV, releasing it as the free chlorine gets used up.
Indoor pools: none needed, since there is no UV.
The problem with too much
Cyanuric acid does not break down and it does not evaporate. It only leaves the pool when water leaves the pool. Every trichlor tablet you add brings more in.
This is why pools go green while the owner insists the chlorine is fine. The chlorine is present and it is chemically locked up.
How to reduce it
Partial drain and refill is the only practical method.
How to avoid getting there
Use liquid chlorine or a salt system for routine sanitising and keep tablets for occasional use.
What matters in Dubai
Dubai heat, dust and strong sunlight change pool water quickly. Swimming pool maintenance needs regular testing and a clean circulation system. Chemical treatment works properly only when the pump and filter are doing their part.
What to check before work starts
The existing pool or room should be inspected as a complete system. Visible damage may sit beside a separate problem in the pipework, controls, waterproofing or ventilation. A written scope should identify the affected parts and state which surrounding surfaces need protection or opening.
The maintenance approach should match the pool finish and the installed equipment. Salt systems, automatic dosing and standard chlorination have different service needs, while shaded pools behave differently from exposed pools.
Related pool services
The subject may connect with swimming pool construction and swimming pool maintenance. Swimming pool repair can be relevant as well. Swimming pool tiling applies where the shell or finish is opened. Sauna installation and steam room work are separate wet-area services.
- Swimming pool construction and renovation
- Swimming pool maintenance and water care
- Swimming pool repair and equipment work
- Swimming pool tiling and waterproofing
- Sauna and steam room installation or repair