4 Ways to Lower High Cyanuric Acid in a Pool

Drain and refill a third to half the pool This is the only reliable method. Test CYA first; if it’s over 100 ppm, drain more. Check local rules before draining.

Use a reverse osmosis filtration truck It removes CYA without draining, but costs a few hundred dollars. Overkill for most residential pools.

Avoid chemical additives No product can lower CYA. The molecule is stable and won’t break down from shock, algaecides, or anything else.

Switch to unstabilized chlorine Most CYA comes from stabilized tablets (dichlor or trichlor). Use liquid chlorine or a salt system to prevent future buildup.