Sludge Away speeds up the removal of sludge & muck naturally. Especially helpful for ponds that have a rock or gravel bottom & where vacuuming is impractical. It is formulated specifically for the removal of organic bottom solids that are slow to degrade. Sludge Away removes bottom organic sludge and muck, reducing or eliminating the potential harmful gaseous compounds, and helps clarify your pond water at the same time.