TPP Syringe Filters. Sterile. 33mm Large quadratic filter surface of 49 and 69 cm2 High flow rate. Premium PES (Polyethersulfone) filter membrane - pore size of 0.22 um. item Tp99150 TP9S250 Quantity l,'bag, 1B/cs I 'bag. 12/cs 'bag, 10/cs "bag, g/cs f/pk, 40/cs 1 40/cs Advantages Of Syringe Filters: Designed for high flow rate 0.22pM or 0.45vM