API Pond Zyme Sludge Destroyer, 8 OzSpecially selected bacterial strains in API POND ZYME SLUDGE DESTROYER bacterial cleaner immediately begin breaking down fish waste and dead algae that cause cloudy water, sludge build up, and debris that clogs pumps and filters. Through enzymatic action, POND ZYME SLUDGE DESTROYER bacterial cleaner reduces pond maintenance and keeps pond water clean and clear. It is a 100% natural product, & safe for all pond fish, plants, and wildlife. Initial dose