Orenda PR-10000-QT Phosphate Remover Concentrate, 1-Quart Phosphate remover concentrate is the strongest phosphorus control product It is a highly concentrated solution formulated to react with phosphates in pool water and water-born It helps prevent interference with chlorine sanitizing and disinfection caused by algae It will not either effect water chemistry parameters or create residues detrimental to water quality per pack comes in 1-quart container