SLGL0250S. A 25 mm diameter sterile syringe filter with a 0.22 µm pore size Mixed Cellulose Esters membrane. Comes in a pack of 50. Pricing. Match Criteria: Product Name. Millex Syringe Filter Unit, PTFE, Hydrophilic, Non-sterile. Millex Syringe Filter Unit, PTFE, Hydrophilic, Non-sterile. Product Number.