Pondmaster Pond Fix 2.5 lb. jar. with Activated Barley, Danner. Restores balance to pond environment. Cleans ponds by breaking down organic materials that create problems around waterfalls, streams, rocks, plant pots, pumps, and filtration systems. Reduces excessive nutrient content that contributes to organic growth. Enhances filtration systems. 3 year shelf life. 2.5 lb. jar treats 20,000 gallons.