Specially selected bacterial strains in PondCare Pond-Zyme with Barley 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 with Barley reduces pond maintenance and keeps pond water clean and clear. Helps pond filters stay cleaner longer. Pond-Zyme with Barley is 100% natural product, safe for all pond fish, plants and wildlife.