Sartorius 11406-25N Membrane Filter Disc, Cellulose Nitrate, Non-Sterile, 0.65 μm, 47 mm, White with Black Grids (Pack of 100): Amazon.com: Industrial & Scientific
Buy Sartorius 11107--90------G, Acetate Membrane Filter, 0.2um - Mega Depot
Why are Sartorius Membrane Filters more effective? - Trafalgar Scientific Ltd