Tisch Scientific PES Membrane Filter, 0.22 µm, 47 mm, Nonsterile, 200 Pack, SF15021. Regular Price $162.91 Price $141.66. Add to Cart. Add to Wish List. Tisch Scientific MCE Membrane Filters, White w/Black Grid, 0.22 µm, 25 mm, Nonsterile, 100 Pack, SF14714. Regular Price $34.69 Price $30.17.