Specially selected bacterial strains in API® pond-Zyme sludge destroyer 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 reduces pond maintenance and keeps pond water clean and clear. Pond-Zyme sludge destroyer is a 100% natural product and safe for all pond fish, plants and wildlife.