Isopore Membrane Filter, 0.2 µm pore size, hydrophilic polycarbonate membrane, 25 mm diameter 0.22 μm pore size 13.8 % porosity Expand VSWP01300 MF-Millipore ® Membrane Filter, 0.025 µm pore size, 13 mm diameter, mixed cellulose esters (MCE) membrane, hydrophilic, white, 100 discs 0.025 μm pore size 72 % porosity Expand SMWP04700