Applied Biochemist 406303A Black Algaetrine Algaecide, 32-Ounce

This algaecide formulation was specially designed to fight tough black algae. Contains copper and exclusive penetrating agents to kill and prevent the growth of even the most deeply-rooted algae cells. It allows for swimming without waiting, is safe for all pool types and will not discolor the water when used as directed. Attacks deeply rooted black algae. Safe for vinyl, plaster, colored and fiberglass pools. Combination of algaecides specially formulated for black algae. Contains 3.07-percent active copper. Algaecides are most effective when applied in the morning on warm, sunny days. Black algae is protected by a tough, waxy coat, it is important to use an algaecide specifically for black algae such as black algaetrine algaecide. Compatible with chlorine, bromine and ozone sanitizers. Product contain 32-ounce. Includes 12 pieces per pack.