WQA Certified - SeaKlear Phosphate Remover for Pools, 1 Pint Bottle Commercial Strength! One quart removes 9,000 ppb of orthophosphates per 10,000 gal of pool water Removes phosphates generated from fertilizers, cleaners, pool chemicals and other pollutants. For weekly maintenance and treatment Enhances performance of salt systems WQA Certified (NSF/ANSI Standards 50 & 60)