MF-Millipore ® Membrane Filter, 0.45 µm pore size, 25 mm diameter, mixed cellulose esters (MCE) membrane, hydrophilic, white, 100 discs GTTP04700 Isopore ™ Membrane Filter, 0.2 µm pore size, hydrophilic polycarbonate membrane, 47 mm diameter HVLP02500 Durapore ® Membrane Filter, 0.45 µm, 0.45 µm pore size, hydrophilic PVDF, 25 mm membrane SKBM02560