Whatman 6875-2502 GD/X 25 mm Syringe Filter, PTFE filtration medium, 0.2 um (1500 pcs) Regular Price $2,733.72 Price $2,374.02. Add to Cart. Whatman Puradisc 25 mm PVDF Syringe Filters, 0.2 µm, 50 Pack, 6746-2502. Regular Price $183.92 Price $159.72. Add to Cart.