MF-Millipore ® Membrane Filter, 5 µm pore size, 47 mm diameter, mixed cellulose esters (MCE) membrane, hydrophilic, white, 100 discs. LSWP04700. Mitex ™ Membrane Filter, 5.0 µm pore size, hydrophobic PTFE, 47 mm. GPWP04700. Millipore Express PLUS Membrane Filter, 0.22 µm pore size, hydrophilic polyethersulfone, 47 mm idiameter.