Purifier

The invention relates to the field of water treatment, particularly to the deep filtration and purification of drinking water, and comprises a filter element, an inlet and an outlet pipeline interfaces, and a water path switcher connected between the inlet and the outlet pipeline interfaces and the filter element, wherein the water path switcher comprises two switching disks with 2 to 16 switching positions and a plurality of switching water gaps that are arranged in the switching positions on the contact surface between the two switching disks and respectively communicate with the water paths. The water path switcher further comprises a pressing component and a closed switching interface formed at the periphery of the switching water gaps by the contact surface of the two switching disks with overlapping axis of rotation; the two switching disks contact each other and can rotationally change the relative switching positions. The invention has the advantages of simple and practical structure, low cost, good repercussion effect, improved purifying effect and prolonged service life of the filter element. Through the switching of the water path switcher, multiple layers of the filter element or multi-stage filter element can be thoroughly washed layer by layer or stage by stage, and the impurities can be discharged layer by layer or stage by stage.