An Alternative Approach to Algae Control MICROBIAL ALGAE CLEAN is the first bacterial algaecide registered with the EPA (Environmental Protection Agency). This product contains patented bacteria to control green water algae in ponds with live fish and plants. The bacteria help establish and maintain a clean pond, free of algae. They also help improve dissolved oxygen levels and reduce noxious odors from the pond. Biological inhibitor of green water algae. Promotes a cleaner pond environment. Eliminates troublesome organic sludge and debris.