Whatman 10463401, Polydisc GW Filter 50 mm, nylon with quartz fiber preFilter, 0.45 um (50 pcs) Regular Price $442.74 Price $385.00. Add to Cart. Add to Wish List. Whatman 10463500 ReZist Syringe Filter, 30 mm, PTFE, 0.2 um, sterile, 50 per pack. Regular Price $187.52 Price $163.06.