Whatman Puradisc 25 mm H-PTFE Syringe Filters 0.45 µm, Hydrophilic, 50 Pack, 6772-2504. Regular Price $89.85 Price $78.03. Add to Cart. Whatman SPARTAN HPLC Syringe Filter, 30 mm, Regenerated Cellulose, 0.45 µm, 50 Pack, 10463053. Regular Price $146.82 Price $127.50.