a, 1, coarse filter filter filter is the core part of the filter core, the filter element is composed of the filter box and stainless steel wire mesh, stainless steel wire mesh is appropriate loss, need special protection; 2, after a period of time when filters work, impurities in a certain filter core, the pressure drop increases, the velocity drops, shall promptly remove the impurities in the filter core; 3, clean the impurities, pay special attention to the stainless steel wire mesh on the filter element cannot deformation or damage, otherwise, again installed filters, the purity of the filtered medium can not meet the design requirements, compressor, pump, instruments and other equipment will be destroyed; 4, if found, stainless steel wire mesh deformation or damage should be replaced immediately. Second, precision filter, precision filter 1 is the core part of the filter cartridge, filter core is composed of special materials, belongs to the appropriate loss, need special protection; 2 after working for a period of time, when the precision filter, filter filter to block a load of a certain amount of impurities, the pressure drop increases, the velocity is reduced, shall promptly remove the impurities in the filter, at the same time to clean the filter element; 3, remove impurities, in particular attention to the precision filter, deformation or damage, otherwise, put up the filter, the purity of the filtered medium can not meet the design requirements; 4, some precision filter, can not be repeated use, such as bag filter, pp filter, etc. ; 5, if discover filter deformation or damage, should be replaced immediately.