Sterile Millipore S-Pak Type HA Membrane Filters, 47 mm, 0.45 µm, gridded, 600/pk

For membrane filtration in microbiological analysis of aqueous samples. "HA" signifies certified compliance with Standard Methods criteria with pore size of 0.45 um. White, cellulose and mixed-ester composition. S-Pak (filter only) is sterile. Diameter: 4