Pond Force Barley Straw Extract (16oz Treats 8000 Gallons) This all natural product effectively promotes water clarity in an environmentally responsible manner This Concentrated Formula is fast acting and achieves better results within a short time Safe for fish, pets, aquatic plants, and animals Shake well. Apply 2 fl oz per 1000 gallons of pond water, ever 1-2 weeks. Packaging is fully recyclable