Whatman 6871-2504 GD/X 25 mm Syringe Filter, nylon filtration medium, 0.45 um (1500 pcs) Regular Price $3,093.68 Price $2,690.16. Add to Cart. Whatman Puradisc FP 30 mm Cellulose Acetate Syringe Filter, 0.45 µm, Sterile, 50 Pack, 10462100. Regular Price $195.82 Price $170.28.