Over a period of time deposits such as grease, fat, silt and mineral scale build up on the pipe walls. This accumulated material makes the wall rough reducing the ability of the drain to rapidly move the water it contains. As the water flow slows more materials are deposited worsening the situation. The most effective way to clear the drainage pipes and inspection chambers of these deposits is high pressure water jetting. The high-pressure water spray acts like a sharp knife and cuts the grease off the walls of the pipe. The water used in the process itself creates a high water flow, which will flush the sediments down the line.