GLB Algimycin 1000 is a copper/quat algaecide formulated to eliminate the toughest black algae. This product uses a special triple-chelation process to hold copper ingredients in solution for longer algae control. The outer layers of black algae produce a waxy coat that prevents chlorine and other algaecides from killing it. Algimycin 1000 is specially formulated to penetrate this waxy coat and treat even the most deeply rooted black algae. This product is compatible with chlorine, bromine, mineral purification systems, salt water pools, and ozone sanitizers.