Phoslock is a patented phosphorus locking technology to restore water quality in ponds, lakes and reservoirs. Phoslock was developed by the Australian national science agency, Commonwealth Scientific and Industrial Research Organization (CSIRO), to remove phosphorus from water bodies and restore water quality. For over ten years, Phoslock has been successfully used in water resource restoration programs around the world. Although Phoslock is a new technology to the United States (2010), it is rapidly emerging as the most effective phosphorus inactivation and water quality restoration solution for ponds, lakes and reservoirs.

Given the favorable features of Phoslock, such as its very low toxicity, its ability to permanently bind free reactive phosphorus (FRP) over a wide range of water chemistries, and the fact that it does not form flocs, Phoslock is emerging as the most effective phosphorus locking technology for in-situ phosphorus management in surface water.