Pall 4508 Acrodisc Syringe Filters with Supor Membrane, Pore Size 0.45 µm, Diameter 25 mm, Pack of 1000: Amazon.com: Industrial & Scientific
Acrodisc® PSF Syringe Filters, 25 mm, Pall Laboratory | VWR
Pall 4503 Acrodisc Syringe Filters with PTFE Membrane, Pore Size 1 µm, Diameter 25 mm, Pack of 1000: Amazon.com: Industrial & Scientific
Daigger 4497, Acrodisc Syringe Filter with HT Tuffryn Membrane, Non Sterile, 25 mm Diameter, 0.00045 mm (Pack of 300): Amazon.com: Industrial & Scientific