FritzPond Barley Extract is the perfect natural solution to keep your pond's water pristine. Our extract is the same as barley straw, without the fuss and bother of setup. Its enzymatic fermentation process eliminates dirt and debris, creating a clean and clear environment. Every two weeks, use the concentrate to maintain this serene atmosphere—compatible with FritzZyme® biological products and any other FritzPond conditioners and clarifiers. Elegant, easy-to-use and safe for any aquatic life or plants, FritzPond Barley Extract will make your pond a picture of health. Directions & Dosage: Add 1 cup (8 oz) per 500 US gallons (1,893 L) for the initial dose, then 1 oz (1/8 cup) per 500 gallons every two weeks. Do not use when water temperature falls below 45°F.