20 Pack Syringe Filter Sterile PES 0.22um Pore Size, 33mm Membrane Diameter, PES Hydroplihic Filtration High Throughput for Lab HPLC Sample Preparation Individually Packed by Labfil: Amazon.com: Industrial & Scientific
At Least 11 Things You Didn't Know about Filtration (but you should, because you probably do it all the time) | Biocompare: The Buyer's Guide for Life Scientists