Oct 21, 2021 · Millex Sterile Syringe Filter, 0.22 um Mixed Cellulose of. A 25 mm diameter sterile syringe filter with a 0.22 µm pore size Mixed Cellulose Esters membrane. Use for the clarification of water, buffers, or aqueous solutions and for the sterilization of drugs or aqueous solutions administered intravenously. Comes in a pack of 50.