Syringe Filters, 0.2um Whatman syringe filters can be found in different diameters, pore sizes, and membrane types. Select from sterile or nonsterile versions without or with prefilters.Syringe filters are the primary option for analytical sample filtration. Whatman 6870-2502 GD/X 25 mm Syringe Filter, nylon filtration medium, 0.2 um (150 pcs)