Whatman 6900-2502 GD/X 25 mm Sterile Syringe Filter, PVDF filtration medium, 0.2 um (50 pcs) Regular Price $210.67 Price $182.95. Add to Cart. Add to Wish List. Whatman PTFE Mini-UniPrep syringeless filters, 0.2 µm, translucent housing, slit septum cap, 100 pack, US203NPEORG. Regular Price $284.54 Price $247.10.