If you're looking for a highly concentrated liquid black dye for your ponds, we've got it! This product is equivalent to other companies ONE Gallon containers. Pond Dye helps prevent weeds and algae from growing by naturally blocking out the sun's harmful UV rays. A must have to naturally keep your pond weed free and also add an attractive rich black colour to your pond. Product is safe for recreational ponds, horses, cattle, birds, fish wildlife and the environment. Each container treats 1 acre of a pond 4' - 6' feet deep. U.S.A.