1000ML Vacuum Filter System, PES Filter, 50 mm Diameter, 12/Case. Has 0.22 µm and 0.45 µm Pore Sizes. $215/case of 12 1000ml vacuum filter system, PES filter, 50mm in diameter. Free ground shipping on orders $200 and up. Filter systems include solution bottle, PES membrane for high flow and low binding. Sterile (gamma irradiated). 1/Bag, 12/CS.