Regular Price $172.99 Price $150.23. Add to Cart. Whatman Puradisc 25 mm PVDF Syringe Filters, 0.45 µm, 200 Pack, 6747-2504. Regular Price $594.62 Price $516.38. Add to Cart. Whatman 6871-2504 GD/X 25 mm Syringe Filter, nylon filtration medium, 0.45 um (1500 pcs) Regular Price $2,733.72 Price $2,374.02. Add to Cart.