Melt Blown D Series Filter Cartridges is fusing and intertwined of polypropylene resin without any chemical glues.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.Deep grooved surface highly extend the filtration surface area, which makes the filter has a higher flow rate and lower pressure drop.