Pool Mate 1-Quart 2-Pack Concentrated Black Algaecide, Algaecide for Pool, Made in USA

Controls the growth of black algae in swimming poolsConcentrated formula for all pool typesWeekly maintenance dose: 4 ounces per 10,000 gallonsNon-foamingNon-metallic algaecideFor All Pool Types (Vinyl, Fiberglass, Concrete, Gunite, etc.)Prevents and kills algae