GVS Filter Technology Syringe FilterPolyethersulfone Syringe Filter, sterile in blister0.22 µm Pore Size, 25 mm Membrane Diameter, 50 pieces per box.Polyethersulfone (PES)Hydrophilic membrane. designed to remove particulates during general filtration, low protein and drug binding characteristics make it ideally suited for use in life science applications. Its strength and durability are