Whatman 10401726, Mixed Cellulose Ester Filter, ME Range (ME 24), plain, 0.2 um pore size, 110 mm circle (50 pcs) Regular Price $364.59 Price $316.62. Add to Cart. Add to Wish List. Whatman Nuclepore Hydrophilic Membrane, 0.4 µm Pore Size, 50 mm Circle, 100 Pack, 111207. Regular Price $179.76 Price $156.10.