MD Pellets are slow-release probiotic pellets that sink down into the muck to deliver essential biostimulants and indigenous bacteria. They penetrate and degrade pond mick by metabolically stimulating naturally occurring bacteria and adding sludge-eating cultures. The pellets are a dense product designed to be "tossed in" and sink to the bottom. When they sink into the muck, the probiotic produces enzymes that speed up the breakdown of organic waste. It contains safe and beneficial bacterial and will not harm aquatic species, fish, waterfowl or people.