SLFG025LS. A 25 mm diameter sterile syringe filter with a 0.2 µm pore size hydrophobic PTFE membrane, ethylene oxide sterilized. Millipore. pricing. SLFGL25BS. A 25 mm diameter sterile syringe filter with a 0.2 µm pore size hydrophobic PTFE membrane, with Luer outlet, ethylene oxide sterilized. Comes in a pack of 50.