Why is the standard lower for public pools?
The recommendation to limit to 15 ppm is related to safety.
In public pools, fecal contamination (AFR) may occur. To destroy pathogens such as Cryptosporidium and Giardia, a certain contact time between chlorine and water (CT) is required.
At CYA levels above 15 ppm, effective disinfection becomes practically impossible.
How to lower CYA levels
The simplest and safest way is to dilute the water. You need to partially drain the water and add clean water.
The math is simple:
to reduce the CYA level by half — you need to replace half of the water volume.
It is important to note that cyanuric acid can settle on pool surfaces.
How to prevent CYA buildup
The best strategy is to not let it build up.
To do this:
— use unstabilized chlorine
(sodium hypochlorite or calcium hypochlorite)
— monitor CYA levels regularly
Conclusion
Cyanuric acid is not just an "additional parameter" but a critically important element of water balance in an outdoor pool.
It simultaneously protects chlorine but can reduce its effectiveness when in excess.
Therefore, the main rule:
control and balance, not maximum values
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