Choosing a Pore Size. Pore size options are typically 0.05 µm, 0.10 µm, 0.22 µm, 0.45 µm, 0.70 µm, 0.80 µm, 1 µm, 3 µm, 5 µm, and 10 µm.The pore size needed for your syringe filter is typically dictated by your objective or application, so consider what particles you want to eliminate and what you want to capture for your cell culture.