According to the pipeline design grade, it can be divided into water purifier can be divided into two categories: tightening water purifier and self-cleaning water purifier. The traditional water purifier is a gradually tightening water purifier, its internal pipeline design filter element loose front and tight back, composed of PP melt-blown filter, particle carbon, compressed carbon, RO reverse osmosis membrane or ultrafiltration membrane, rear activated carbon, generally the 5 levels are connected end to end. The interception is deposited inside the filter element, requiring regular manual disassembly and washing to ensure the normal operation of the machine. Another kind is more advanced self-cleaning type water purifier, machine design two channels, increased a washing water channel, as the ordinary ordinary life water washing water through the machine filter especially the membrane filter raw water side wash to achieve the effect of cleaning, and use the open and close the moment. Water Clarifier is a safe, environmentally friendly and high water consumption household appliance.