This 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, removing them as a nutrient source for algae formation and growth. It helps prevent interference with chlorine sanitizing and disinfection caused by algae. They are compatible with other water treatment chemicals applied in accordance with manufacturers recommendations and will not either effect water chemistry parameters or create residues detrimental to water quality. Nontoxic and nonhazardous. Professional strength of this concentrate is 1-quart per 10,000-gallons removes up to 10,000 ppb phosphate. Comes in 1-quart container.