Formulated for the removal of organic bottom solids that are slow to degrade, especially helpful in ponds that have a rock or gravel bottom or where vacuuming is impractical. As organic solids accumulate on the pond bottom, they begin to break down releasing toxic gasses. These gaseous by-products can endanger fish, marine life and plants. Microbe-Lift Sludge Away reduces and eliminates potential harmful gaseous compounds and helps clarify your pond water at the same time. Be aware, when added it will temporarily darken the water. The color can take up to 1-2 weeks to dissipate but is harmless to plants, fish or other inhabitants and will not harm humans or animals. The color is due to the type of bacteria necessary to biodegrade the more difficult buildup of debris and sludge. The bacteria must first solubilize the sludge before it can be biodegraded. It is the solubilization process which discolors the water. Depending upon the amount of buildup to be solubilized, the discoloration time will vary.