Quick Reference: "Stabilizer" and "conditioner" are everyday names for cyanuric acid (CYA), the chemical that shields your chlorine from the sun. Ideal range: 30-50 ppm (salt pools often 50-75 ppm). For the full guide, see CYA (Cyanuric Acid).
Stabilizer: Another Name for Cyanuric Acid
If you've seen "pool stabilizer" or "pool conditioner" on a product label, you're looking at cyanuric acid (CYA). They're the same thing. Stabilizer is the chemical that acts like sunscreen for your chlorine. Without it, the sun's UV rays burn off your chlorine rapidly, sometimes tens of percent per hour in strong sunlight.
The short version
- What it does: Protects free chlorine from UV breakdown so it lasts longer and works more efficiently.
- Ideal level: 30-50 ppm for most pools; salt pools often run 50-75 ppm.
- The catch: Too much stabilizer (over about 80 ppm) actually makes chlorine less effective, forcing you to run higher chlorine levels to keep the water sanitary. More is not better.
- How to lower it: There's no easy in-pool chemical fix. The reliable route is partial draining and refilling with fresh water.
Pro tip: Stabilized chlorine products (trichlor tablets, dichlor shock) add CYA every time you use them. If those are your main sanitizer, your stabilizer level creeps up over time, so test it monthly so it doesn't climb past the effective range.
For the complete guide on how to test it, dose it, manage it, and understand the all-important CYA-to-chlorine relationship, see our full entry on CYA (Cyanuric Acid).