Specially selected bacterial strains in 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. Pond Zyme ® with Barley is a 100%-natural product, safe for all pond fish, plants and wildlife.