Pool Water Chemistry

What Is Cyanuric Acid?

Cyanuric acid is a pool-water stabilizer that slows the loss of chlorine caused by sunlight.

Concept comparison: sunlight reaches two water samples; fewer chlorine symbols remain without CYA than with CYA. Illustration of stabilization, not quantitative rates.
Concept comparison: sunlight reaches two water samples; fewer chlorine symbols remain without CYA than with CYA. Illustration of stabilization, not quantitative rates.

Understanding the Concept

It can be added separately or enter water through stabilized chlorine products. It is not itself a disinfectant.

Common Misunderstanding

Stabilization also affects chlorine activity. Follow appropriate guidance for chlorine in stabilized water rather than judging safety by appearance.

Related terms

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