Durapore ® Membrane Filter, 0.45 µm, 0.45 µm pore size, hydrophilic PVDF, 90 mm membrane HNWP04700 Nylon Net Filter, 0.45 um pore size, hydrophilic nylon membrane, 47 mm diameter SSWP02500 MF-Millipore ® Membrane Filter, 3 µm pore size, 25 mm diameter, mixed cellulose esters (MCE) membrane, hydrophilic, white, 100 discs GSWP02500