Milli-DI® 0.2 μm Filter Adapter. Millex-HV Syringe Filter Unit, 0.45 µm. A 13 mm diameter sterile syringe filter with a 0.45 µm pore size hydrophilic PVDF membrane. Comes in a pack of 100. A 4 mm diameter sterile syringe filter with a 0.45 µm pore size hydrophilic PVDF membrane. Comes in a pack of 100.