PROtech 044013P12 Copper Algaecide for Swimming Pools, 1-Quart Effective on the toughest mustard, black, yellow and green algae that cling to the walls and bottoms of pools Unlike the commonly used algaecides, Copper Algaecide is specially formulated to be non-foaming, thereby enhancing pool appearance Is compatible with most chemicals commonly used to treat pools and hence can be used by all customers Can be used in pools treated with chlorine chemicals and its use may reduce the amount of chlorine chemicals normally required The pool can be used immediately after treatment