The Pentair Aquatic Systems R151226 (#79) Cyanuric Acid Test Kit is designed to measure cyanuric acid (CYA) levels in pool and spa water. Cyanuric acid acts as a stabilizer, protecting chlorine from degradation by ultraviolet (UV) rays and ensuring its effectiveness in sanitizing the water. This kit includes an 8 oz bottle of cyanuric acid reagent and a testing slide tube, often supplied in a durable styrene box with a clear top. The testing method typically involves a turbidimetric analysis where pool water is mixed with the reagent, and the resulting turbidity is read using the calibrated test tube or by observing a black dot. Monitoring CYA levels, recommended between 30-50 ppm for traditional pools, is crucial for maintaining proper chemical balance and optimizing chlorine performance. This product is provided in a box of 12 kits.