Cyanuric acid, often abbreviated as CYA, is a chemical compound used in swimming pools to stabilize chlorine. It acts as a shield, protecting chlorine from degradation caused by ultraviolet (UV) rays from the sun. Without it, chlorine would dissipate rapidly, rendering it ineffective as a sanitizer. For example, direct sunlight can reduce chlorine levels significantly within a couple of hours in an unstabilized pool.
The importance of maintaining an appropriate level of this stabilizer lies in its ability to prolong the lifespan of chlorine, reducing the frequency and quantity of chlorine needed to keep the pool sanitized. This offers several benefits, including cost savings on chemicals and more consistent sanitation. Historically, its introduction marked a significant advancement in pool maintenance, allowing for more effective and economical chlorine use in outdoor pools.