Pondzyme Bacterial Cleaner 1 Pound --Heavy-Duty Pond Cleaner--Breaks Down Fish Waste and Dead Algae That Can Cause Cloudy Water, Sludge Build-Up, and Debris That Clogs Pumps and Filters. The Five Strains Of Bacteria In Pond-Zyme Plus Digest Sludge Into Harmless Minerals and Water, treats 16,000 Gallons. Ingredients: Nonpathogenic bacterial cultures. Restricted in Hawaii