If the pond clears up and you don't fertilize it, pond is likley to develop some type of weed problems. Blue dye can then be fairly effective to reduce - suppress amount of weed growth esp deeper than 2-3ft. Dye acts as a shading factor. After the pond is colored. A little dye should be added (1/16 to 20th original amount) every month or so to help maintain proper color and filtration effect.

Last edited by Bill Cody; 03/18/11 12:51 PM.
aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management