5 Facts About Lowering High Cyanuric Acid in a Pool

Partial drain and refill is the only reliable method No chemicals, enzymes, or bacteria will meaningfully lower cyanuric acid. Water exchange is your only real option.

Cyanuric acid does not break down naturally It does not evaporate, filter out, or degrade with normal chlorine use. Once it is high, it stays high until you remove water.

Commercial CYA reducers are not worth the cost Products claiming to reduce cyanuric acid are expensive, slow, and work poorly in practice. Save your money.

Drain a third to half the pool for a meaningful drop If your CYA is above 80 ppm (or 60 ppm with non-stabilized chlorine), drain some water, refill with fresh water, and retest.

Check local regulations before draining Some areas restrict draining pools due to groundwater or sewer rules. Always verify first.