Bio-Active Cyanuric Acid Reducer contains a proprietary composite biocatalyst blend of all natural, micro-organism cultures and enzymes in a nutrient powder. Unlike the use of treatments that can leave residual chemicals in the pool, this product works to safely reduce cyanuric acid levels in swimming pools using a natural biological process. The product also leaves no harmful, or unsightly residual to affect bathers, plumbing, or the environment and is completely biodegradable. 12 per case.