5 Things to Know About Cyanuric Acid in Your Pool

Keep cyanuric acid between 30 and 50 ppm That is the sweet spot for outdoor chlorine pools. It protects chlorine from UV rays without over-stabilizing.

CYA acts as sunblock for chlorine Without it, UV rays burn off chlorine in hours. With too much, chlorine gets locked up and stops working.

In scorching climates, you can push CYA to 60 or 70 ppm But you must keep free chlorine higher to compensate. Most pools do fine at 40 ppm.

Test CYA monthly It does not evaporate. It only decreases when you drain or backwash the pool.

High CYA is the most common pool chemistry mistake The only fix is dilution. Do not let CYA creep up.