Whatman Syringe Filters, 0.2um, Pore Size: 0.2um Whatman 6875-2502 GD/X 25 mm Syringe Filter, PTFE filtration medium, 0.2 um (1500 pcs) Regular Price: $2,560.56 Price $2,226.58 Membrane Filters, PTFE, .22um PTFE Membrane Filters, 0.22 um, 25mm, Nonsterile, with PP substrate (Meets the requirements of USP Plastics Class VI) 200 per pack, SF17375 Regular Price: $140.30 Price $126.88 Whatman 0.22