Marketing InformationNeo-Pure MB Series Standard Melt Blown Sediment Cartridges are made of spun bonded 100% polypropylene creating a cartridge that has high dirt-holding and chemical capacity. Filters available in 2-1/2" and 4-1/2" (BB® -style) cartridge diameters and other lengths. The 4-1/2" diameter graded density pore structure provides true depth-style filtration for higher dirt-holding capacity.