Microbial Algae Clean is the first bacterial algaecide registered with the EPA. This product contains patented bacteria to control and prevent 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 - Will not harm live plants or fish - Treats 19,200 gallons.