Filtering system

The utility model provides a filtering system which comprises a filtering cylinder, a first valve body, a second valve body and a third valve body, and a filtering material is arranged in the filtering cylinder and used for filtering water flow to be filtered. According to the utility model, the valve body is arranged outside the filtering cylinder to control the water feeding and discharging of the filtering cylinder, so that a filtering mode and a backwashing mode are realized. In the filtering process, water flow to be filtered forms rotating water flow on the filtering material, deposition of impurities is reduced, the difficulty of cleaning the impurities is lowered, and in the back flushing process, the rotating water flow formed on the filtering material can scatter the deposited impurities, comprehensively clean the impurities above the filtering material and drive the impurities to rotate, so that the filtering effect is improved. And the cleaning effect during cleaning is improved. According to the