Centrifugal filter： Centrifugal filter is based on the working principle of gravity and centrifugal force to remove solid particles heavier than water. Water enters the centrifugal filter body tangentially from the water inlet pipe, and the rotation generates centrifugal force, which pushes the sand and solid particles with higher density to flow along the pipe wall to form a swirling flow, so that the sand and stones enter the sand collecting tank, and the purified water flows downstream Flow out along the water outlet to complete the separation of water and sand.