A granular chelated copper algaecide. Controls algae before it reaches the surface. Ideally suited for bottom growing algae and spot treatments along docks, beaches, boats, launches and fishing areas. Do not use in waters containing koi, hybrid goldfish, or trout or if hardness of the water is <50ppm. A cost effective solution with easy application. Make sure to adhere to label application rates, in addition to checking for proper protective equipment and permitting requirements in your area.