Sterile syringe filters 0.22 um | Sigma-Aldrich Millex-GV Filter for Samplicity G2, 0.22 µm, PVDF, 33 mm, non-sterile. This 33 mm syringe filter with a Hydrophilic PVDF membrane, for non-sterile filtration on the Samplicity G2 system, has a 0.22 µm pore size used in preparation of protein-containing solutions prior to chromatography or other instrument