Bio-Maxx Muck Pellets are slow-release pellets that sink down into the muck to deliver essential bio-stimulants and indigenous bacteria. They penetrate and degrade pond muck by 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 bacteria produce enzymes that speed up the breakdown of organic waste. They contain safe and beneficial bacteria, and will not harm aquatic species, fish, waterfowl or people. Sold in a 10# pail.