Precision filter is also called surface filter, that is, the impurity particles removed from the water are distributed on the surface of the filter medium instead of distributed inside the filter medium. It is mainly used for the removal of trace suspended solids, before reverse osmosis and electrodialysis, and after the multi-media filter, acting as a security filter. The precision filter consists of a filter housing and a filter element installed inside. When working, water enters the filter element from the outside of the filter element, and the impurity particles in the water are blocked outside the filter element. The filtered water enters the filter element and is led out through the collection pipeline. . The filtration accuracy of the precision filter is generally 1.1-20μm, the accuracy of the filter element can be replaced at will, and the shell mainly has two structures: stainless steel and organic glass. The precision filter should be backwashed once a day during use.