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. Directions For Use: Sprinkle desired dose evenly around the perimeter of the pond. Initial Dose: Using the enclosed spoon, add one spoonful of Pond-Zyme Plus for every 100 US gallons (380 L) twice a week for two weeks. Maintenance Dose: Add one spoonful for every 200 US gallons (760 L) every two weeks. End of Season Dose: Same as initial dose.