GSWP04700. MF-Millipore ® Membrane Filter, 0.22 µm pore size, 47 mm diameter, mixed cellulose esters (MCE) membrane, hydrophilic, white, 100 discs. View Pricing. DAWP02500. MF-Millipore ® Membrane Filter, 0.65 µm pore size, 25 mm diameter, mixed cellulose esters (MCE) membrane, hydrophilic, white, 100 discs.