Replacement Filters. There are 4 products. Prefilter glass fiber filter, 90mm diameter, pack of 100. Nalgene ds0281-9000. Pall 47mm GN Metricel Gridded Filters, Sterile, 0.45um, Pack of 200. Pall 66068. Pall 47mm Supor Sterile Membrane Filter, 0.2 um, Gridded, Pk STERILE Pall Supor Membrane Filter, 47mm, 0.2 um, Gridded, Pk of 200.