In addition to consultations, we also offer a sample program that will be shipped to you right away. Tisch Scientific PES Membrane Filter, 0.22 µm, 47 mm, Nonsterile, 200 Pack, SF15021. Regular Price $162.91 Price $141.66. Add to Cart. PTFE Membrane Filters, 0.22 um, 47mm, Nonsterile, 100 per pack, SF13856. Regular Price $92.06 Price $80.05.