Poly Classic A Melt Blown cartridge filter is made with 100% polypropylene material, it provides superior flow rate and exnt dirt holding performance,which offers good protection for downstream membrane systems. Graded pore structure design can greatly increase its dirt holding capacity and improve its service life.In the manufacture of these filter cartridges, all polypropylene components meet USP, Class VI(121â/250ËF) eria (gaskets/O-rings excluded). The deep filtration structure with thin outer and dense internal gradient has high removal efficiency, which can effectively remove suspended substances, particles, rust and other impurities in the liquid flow.