Oct 29, 2021 · PTFE Millipore Membrane Pleated Cartridge Filter with 0.22 Micron It is an advancedfixed intensive filter and available in a wide range of retention rating from 0.1 to 60 micron. The pore size is not affected by the vibrating of feeding pressure, due to its unique low differential pressure, high flow volume, excellent filtration and attracted many customers.