Lime Green water, in some cases, comes from too much floating “organic debris” in the pond. A small amount of “organic debris” in the pond is normal, and is recommended for your pond’s overall health. Too much debris should be treated. We recommend using a product we carry called PondFix. When added, PondFix clears up murky water and eliminates floating organic debris. All you have to do is dose according to the size of the pond. Be aware, when treating your pond, make sure there is enough oxygenation for your aquatic life because decaying organic material can take away from the oxygen supply.