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EPA-registered Aquashade® is a water dye that filters sunlight to reduce the growth of aquatic weeds and algae. It is also useful for coloring water an attractive blue to enhance its aesthetic quality. Apply to controlled waterways such as ornamental and golf course ponds, lakes, fountains and fish farms. May be used for swimming ponds (after complete dispersal). Results appear immediately and last up to four months in nonflowing waters. The typical application rate is 1 gallon per 1,000,000 gallons of water. Case contains 4 gallons.