MF-Millipore ® Membrane Filter, 0.22 µm pore size, 47 mm diameter, mixed cellulose esters (MCE) membrane, hydrophilic, white, 100 discs Expand WHA1825047 Whatman ® glass microfiber filters, Grade GF/F, Grade GF/F circles, 47 mm, 100/pk Expand AAWP04700