polypropylene melt blown filter cartridge pp melt blown filter cartridge are made of 100% polypropylene without ... to outer,depth filtration inside,coarse fiber in the middle,and fine fiber in the surface.The cartridge has ... substance,particals and rust in the water effectively.Filter media:PolypropyleneFilter rate:1um,5um,10um,20um,30um, ... operating pressure:2.0Bar 10 inch pp melt blown filter cartridge