MF-Millipore ® Membrane Filter, 0.65 µm pore size, 25 mm diameter, mixed cellulose esters (MCE) membrane, hydrophilic, white, 100 discs. 0.65 μm pore size. 81 % porosity. Expand. GPWP04700. Millipore Express PLUS Membrane Filter, 0.22 µm pore size, hydrophilic polyethersulfone, 47 mm idiameter. 0.22 μm pore size.