View Pricing. HAWP02500. MF-Millipore ® Membrane Filter, 0.45 µm pore size, 25 mm diameter, mixed cellulose esters (MCE) membrane, hydrophilic, white, 100 discs. View Pricing. SMWP04700. MF-Millipore ® Membrane Filter, 5 µm pore size, 47 mm diameter, mixed cellulose esters (MCE) membrane, hydrophilic, white, 100 discs.