Orenda Technologies PR-10000 Phosphate Remover - 1 gal PROFESSIONAL STRENGTH - 1 quart per 10,000 gallons removes up to 10,000 ppb phosphate. ELIMINATES PHOSPHATES - Prevents algae by eliminating food source. ELIMINATES NEED FOR ALGAECIDES. NONTOXIC, NONHAZARDOUS. PR-10,000 is the strongest phosphorus control product on the market. Sold in 1 gallon quantities