Whatman 10408714, Mixed Cellulose Ester Filter, ME Range (ME 24), 3.1 mm white/black grid for membrane-butler, 0.2um pore size, 50 mm circle (400 pcs) Regular Price: $475.78. Price $413.73. Add To Cart. Whatman 6872-1302 GD/X 13 mm Syringe Filter, PVDF filtration medium, 0.2 um (150 pcs) Regular Price: $400.66. Price $348.40.