Combination pond dye and biological pond treatment ideal to boost the health, appearance, and ecology of you pond. Manufacturer recommends one application in early fall and one in mid-spring. Formulated for use with humans, fish, livestock, pets, birds, swimming, potable water, and irrigation. Maintains color and clarity all year long. Helps settle out dissolved solids. Helps break down dead leaves and weeds on the pond floor. 1-gallon treats 1-surface acre, 4 to 6-feet deep.