Water to be treated by the filter inlet into the body, impurities in the water is deposited on the stainless steel strainer, thereby creating a pressure differential. And out through the outlet pressure switch monitoring pressure changes, when the pressure reaches the set value, the electrical controls for hydraulic control valve, drive motor signals. After the installation, commissioning and technical personnel by setting filtration time and cleaning conversion time, the water to be treated by the inlet into the body, the filter starts to work, when it reaches the preset cleaning time, electrical controls for hydraulic control valve drive motor signal, causing the following actions: motor driven rotating brush for cleaning the filter, while the control valve is opened for sewage, the entire cleaning process takes tens of seconds duration, when cleaning is finished, close the control valve, the motor stops, restore the system to its original state, began filtering into the next step. Filter casing consists of coarse filter, fine filter, sewage suction pipe, stainless steel or brushed stainless steel nozzle to form seals, anti-corrosion coating, rotating shaft.