Self-cleaning filter is a kind of use of filter screen to directly intercept impurities in the water, remove suspended solids and particles in the water body, reduce turbidity, purify water quality, reduce system dirt, algae, rust, etc., in order to purify water quality and protect the normal operation of other equipment of the system Precision equipment, water enters the self-cleaning filter body from the water inlet, due to the intelligent (PLC, PAC) design, the system can automatically identify the degree of impurity deposition, and signal the sewage valve to automatically discharge the full blowdown.