Minisart® Syringe Filters, 0.22µm/28mm, PES, Sterile, Model FF342-10pcs, Sartorius (CAT#: STEM-L-1785-LKN) Whatman ® Anotop ® 10 IC Syringe Filter, Pore Size 0.2 μm, Polypropylene Housing, Pack of 100, Whatman International Ltd. (CAT#: STEM-L-5097-LC) Whatman ® UNIFLO ® 25 Syringe Filters, Polyethersulfone Membrane, Sterile, Pore Size 0