CrystalClear® AlgaeOff® utilizes the latest in oxygen technology to remove string algae quickly and efficiently. CrystalClear® AlgaeOff® is a EPA registered, granular algaecide that works in seconds, adds oxygen to the pond, removes odor and is the only water treatment product on the market with a manufacturer's money back guarantee. Keeps fountain intakes clean and removes unsightly scum and algae from perimeter Helps eliminate green water Non-toxic to fish EPA-Registered Algaecide 3 year shelf life Usage Details For Light Algae Growth, use 1/4 cup (2 oz) of AlgaeOff® per 50 square feet. For Heavy Algae Growth, use 1/2 cup (4 oz) of AlgaeOff® per 50 square feet. These are recommendations. Always read and follow label instructions prior to use. When To Use For best results use when algae is actively growing. How To Apply Turn off water pumps and fountains before applying CrystalClear® AlgaeOff®. Apply granulars directly on to damp, infested areas. Let it set for 15-20 minutes before turning on pumps. Remove any debris after treatment and wait at least 48 hours if second treatment is required. Not available for purchase in California CrystalClear® AlgaeOff® Dosage Rates Surface Area (In Square Feet) AlgaeOff® 25 – 50 Square Feet 1/4 cup 51 – 100 Square Feet 1/2 cup 101 – 150 Square Feet 3/4 cup 151 – 200 Square Feet 1 cup 201 – 250 Square Feet 1-1/2 cups