Minisart® Syringe Filter, Polyethersulfone (PES), Pore Size 0.45 µm, Ethylene Oxide, Female Luer Lock, Male Luer Slip, Pack Size 50, by Sartorius. Minisart® High Flow with polyethersulfone (PES) is optimal for highest flow rates and a pH of 3 - 12. Type 16533 with a pore size of 0.45 µm can be used for clarification and has a male luer slip