Structure characteristics: 1. filter type: pure physical purification filters, filters and decolorization of nonwoven filter and filter sand filter; 2. filter residue discharge: after non-woven filter in the filter, the filter residue to dry residue with non-woven fabric in the form of automatic discharge and discharge of dry residue in accordance with requirements of the national environmental protection and emission reduction; 3. operating mode: try computer-controlled automatic operation/manual control; 4. the filter can be re-used, bleaching sand filter replacement once every six months to one year; 5. human computer interface in Chinese, user-friendly operation