Specially selected bacterial strains in 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, & safe for all pond fish, plants, and wildlife.