Welded Syringe Filters, Pack of 100, [PTFE Hydrophilic Membrane] Diameter 13mm Pore Size 0.22μm, Non Sterile Filtration by Labfil. 4.0 out of 5 stars. 14. $36.99. $36. . 99 ($3.70/10 Items) $10.00 coupon applied at checkout. Save $10.00 with coupon. Get Quotation Whatman™ Uniflo™ Syringe Filters | Cytiva