Applied Biochemists 406303A Black Algaetrine Swimming Pool Algaecide & Deposit Control, 32 fl oz, White

Algaecides is a combination of specially formulated for black algaeContains copper and exclusive penetrating agents to kill and prevent the growth of even the most deeply-rooted algae cellsAllows for swimming without waiting; safe for all pool types and will not discolor the water when used as directedMost effective when applied in the morning on warm and sunny daysCompatible with chlorine, bromine and ozone sanitizers