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Barley straw pellets are made from concentrated, organic barley straw enriched with peat and humate. About 2 lbs will treat 150 gallons for up to one year or 400 gallons for up to four months. For 150 gallons of clear water, apply 4 ounces every six weeks. For 150 gallons of turbid water, apply 9 ounces every six weeks. Each bag includes a graduated measuring cup.