20 Count Syringe Filter (PES-25mm 0.22um): Amazon.com Product description. Size: PES-25mm 0.22um. Feature: filter diameter: 25mm, pore size: 0.22um, membrane material: PES , hydrophilic property . Syringe filters are made of inert plastic house, membrane, and luer lock fit. It is used with disposal syringes or filtration device with luer fit.