Instantly beautify your pond, lake or fountain with PondWorks pond dye to naturally and effectively control underwater growth of unwanted algae, unwanted plant growth without the use of herbicides or pesticides. It's easy to use, start by calculating the volume necessary for your application. One gallon of super concentrated formula will treat 1 acre - 3-5" deep. Pour PondWorks from the shore in several locations around the pond and it will disperse on its own. Can take up to 24 hrs for complete dispersion. This product is a food grade dye that is 100% safe for people, pets and fish. For use in residential subdivision and commercial ponds, golf course lakes and ponds.