3 Ways to Lower High Cyanuric Acid in a Pool

Drain and refill Draining a third to half the pool and refilling is the fastest, cheapest, and most reliable method. It works immediately with no waiting or monitoring.

Use an enzyme-based CYA reducer These break down cyanuric acid over a few weeks, but they require exact dosing, low chlorine levels, and patience. For CYA over 100, you may need multiple doses, and the product is not cheap.

Hire a reverse osmosis service A truck filters the water without draining, which works quickly but costs a few hundred dollars. Availability is limited, so you must find a local provider.