ALGAEFIX effectively controls these types of algae:  Green or Green water algae (chlorella), String or Hair algae (Cladophora) & Blanketweed (Oedogonium) in ornamental ponds & fountains.  Will not harm aquatic pond plants, koi or goldfish.  EPA Reg#: 8709-8

FOR OPTIMUM RESULTS WITH ALGAEFIX: Use Beneficial Pond Bacteria to eat the dead decaying algae before it turns into fuel for even more unwanted pond algae.