... structure of loose outside and tight inside,it mainly filter the low viscosity and impurity matters,such as the ... suspension,particles,rust and other impurities.The kind of filter cartridge is used in filtering the tap water,drink, ... chemical liquid,oil,paint and so on. 2.) Type:PPXP (Polypropylene Wirewound filter cartridge),PPXD (Polypropylene oversized Wirewound filter cartridge)PPXG (Polypropylene ...