Whatman 6870-2502 GD/X 25 mm Syringe Filter, nylon filtration medium, 0.2 um (150 pcs) Regular Price $539.90 Price $468.86. Add to Cart. Whatman Puradisc FP 30 mm Cellulose PTFE Syringe Filter, 0.2 µm, Sterile, 50 Pack, 10462300. Regular Price $197.90 Price $171.86.