Professional ptfe membrane filter 0.22 um South Africa Microbiology Filters | Hach South Africa - Overview 2936500 · Membrane filters millipore S-pak type HA, 47 mm, 0.45 um pore size, pk/600 ; 2916900 · Filter membrane, EZ-Pak, 0.22 micron, 47 mm, white, gridded, 600/