EMD Millipore S-Pak HAWG047S6 Mixed Cellulose Ester Sterile Filter Membrane, 0.45µm Pore Size, 47mm Filter Diameter, White, Gridded Surface (Pack of 600) 5.0 out of 5 stars 3 LabExact 045SG-047 Mixed Cellulose Esters (MCE) Filter Membrane, Hydrophilic, Sterile, Gridded, 0.45µm Pore Size, 47mm Diameter (Case of 1000)