5 Things to Know About Lowering Pool Cyanuric Acid

Partial drain and refill is the only practical fix CYA does not break down on its own, and no chemical removes it quickly. Dilution is the only reliable method.

Drain 75-80% if CYA is at 150 ppm Most pools target 30-50 ppm. At 150 ppm, you need to replace most of the water, often in multiple partial drains over several days.

Never drain a concrete pool completely Emptying a concrete pool can cause the gunite to float or crack. Always do partial drains.

Avoid CYA-lowering bacteria treatments These treatments take weeks and produce unpredictable results. They are not worth the hassle for most pool owners.

Prevent future buildup by limiting trichlor tablets Over-stabilizing with trichlor is the main cause of high CYA. Switch to liquid chlorine or non-stabilized alternatives.