Minisart® Syringe Filter, Polyethersulfone (PES), Pore Size 0.22 µm, Gamma irradiated, Female Luer Lock, Male Luer Lock, Pack Size 50. Minisart ® High Flow with polyethersulfone (PES) is optimal for highest flow rates and a pH of 3 - 12. Type 16532 with a pore size of 0.22 µm can be used for sterile filtration and has a male luer lock outlet.