Other recommended products. Corning® Syringe Filters, PTFE Membrane, CLS431227, Corning, Inc. (CAT#: STEM-L-4266-Y) Whatman ® Anotop ® 25 Plus Syringe Filters, Pore Size 0.1 μm, Glass Microfiber Prefilter, Whatman International Ltd. (CAT#: STEM-L-5107-LC)