Crystal Clear Barley Extract Liquid is a powerful water treatment that works quickly and effectively to reduce and eliminate decomposition byproducts for clean, healthy ponds. A natural and effective solution that can be used year round. Apply 1 ounce per every 500 gallons, every 2 weeks. If water is extremely dirty, double the dose and use weekly until water is clear. Apply to area of pond where water flow is greatest for best dispersion. Crystal Clear Barley Extract Liquid is a tremendous product to help clarify the water in your pond.