Membrane Filter .22 found in: Nylon Membrane Filters, Magna PES Membrane Filters, 250mL Filter System, PES Filter, 0.22µm, 50mm, Sterile, 150mL Filter.. diameters and improves stability Polyethersulfone (PES) membrane for high flow and low binding Two membrane pore sizes: 0.22µm or 0.45µm Filter systems include bottle top filter and solution bottle with cap Bottle top filters fit