Cyanuric acid is a chemical compound added to swimming pool water to protect chlorine from degradation by sunlight. Without it, the sun’s ultraviolet (UV) rays rapidly break down chlorine, rendering it ineffective as a sanitizer. For instance, unstabilized chlorine can dissipate within hours on a sunny day, requiring constant replenishment.
The presence of cyanuric acid significantly extends the lifespan of chlorine in pool water, reducing the amount of chlorine needed to maintain proper sanitation levels. This leads to cost savings on chlorine products and minimizes the potential for chlorine-related skin and eye irritation. Its use became widespread as pool owners and professionals sought more efficient and cost-effective ways to manage water chemistry.