The other is a more advanced self-cleaning water purifier. Two channels are designed in the machine, and a washing water channel is added. There is a complete channel for washing water and purified water, and both of them do their own thing to make the water move. As ordinary domestic water, washing water washes the raw water side of the filter element in the machine, especially the membrane filter element, so as to achieve the function of self-cleaning, and the intercepted dirt can be quickly discharged in time by using the water originally flowing out from the head and the tail at the moment when the washing faucet is turned on and off. The structure design is reasonable, which saves the trouble of manual disassembly and cleaning, avoids the secondary pollution of the mechanism itself and reduces energy consumption. However, consumers should pay attention to identification. Self-cleaning water purifiers are different from automatic sewage purifiers, computer automatic flushing water purifiers and automatic backwashing water purifiers seen in the market. The former is self-cleaning, which means that all the filter elements in the machine have certain self-cleaning function. Generally speaking, the self-cleaning water purifier is equivalent to installing a garbage disposal device on the pipeline, which can clean up the dirty things at any time without leaving them in the machine. The traditional non-self-cleaning water purifier is equivalent to putting several trash cans in the room, and the dirt is usually temporarily stored in the machine, so it is necessary to regularly discharge the sewage and often disassemble, clean and replace the filter element.