SLFG050. Millex-FG, 0.20 µm, hydrophobic PTFE, 50 mm, A 50 mm diameter non-sterile syringe filter with a 0.2 µm pore size hydrophobic PTFE membrane. Comes in a pack of 10. View Pricing. SLGVV255F. Millex-GV Filter, 0.22 µm, A 25 mm diameter sterile syringe filter with a 0.22 µm pore size hydrophilic PVDF membrane.