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The internal structure of the automatic brush self-cleaning filter is composed of stainless steel filter, stainless steel wire brush and transmission parts, which are automatically cleaned and discharged by the transmission motor and electric valve, and the operation mode is automatic operation (can also be operated manually), with the dual functions of differential pressure and timing automatic sewage discharge. When the water flow passes through the filter, the impurities in the water are intercepted by the filter screen, and the impurities accumulated on the surface of the filter increase to make the pressure difference to the set value, the differential pressure switch sends a signal, the drive motor starts, the blowdown valve is opened, and the impurities deposited in the filter are brushed under the rotating brush and discharged from the sewage outlet, and the whole brushing and sewage discharge process is operated without personnel and without stoppage.