PP  resin bonded  Filter Cartridge is fusing and intertwined of polypropylene resin without any chemical glue. The cartridges are glued at random to form 3D micro pore which will make the cartridge 3 layers with fine fibers in surface and coarse fibers and deep filtration. As the fiber and density form high filtration rating and pollutants holding capacity on diameter of filter cartridge, low pressure drop, gradual changing deep filtration structure with loose outside and close inner, strong pollutants holding capacity, it can remove contaminant effectively, such as suspended substance, particulate and rust, providing efficient filtration and long service life. The hairy surface increases the resistance to the liquid flow, which makes the filters has better dirt holdingcapacity.