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Q-Max® with Polyethersulfone (PES) membranes are available in different types - 13 mm and 25 mm with 0.22 µm and 0.45 µm membranes. - Sterile 25 mm with 0.22 µm and 0.45 µm membranes. PES is a very porous membrane type mainly used for filtration of aqueous liquids, pH-14, and some solvents. PES is a low protein binding membrane type.