Millex-GV Filter, 0.22 µm A 25 mm diameter sterile syringe filter with a 0.22 µm pore size hydrophilic PVDF membrane. Comes in a pack of 50. | Sigma-Aldrich
PES Double Luer Lock Syringe Filter, 25mm dia, .22 um, Nonsterile, 100 per pack | Tisch Scientific