MF-Millipore ® Membrane Filter, 0.22 µm pore size, 25 mm diameter, mixed cellulose esters (MCE) membrane, hydrophilic, white, 100 discs Expand GTTP04700 Isopore ™ Membrane Filter, 0.2 µm pore size, hydrophilic polycarbonate membrane, 47 mm diameter Expand HNWP04700 Nylon Net Filter, 0.45 um pore size, hydrophilic nylon membrane, 47 mm diameter