PTFE Hydrophilic Membrane Filters, 0.22 um, 47mm, Nonsterile, 200 per pack, SF13841 Regular Price $296.25 Price $257.61 Add to Cart PTFE Hydrophilic Membrane Filters, 0.22 um, 90mm, Nonsterile, 100 per pack, SF13842 Regular Price $586.39 Price $509.90 Add to Cart PTFE Hydrophilic Membrane Filters, 0.22 um, 13mm, Nonsterile, 400 per pack, SF17921