Millex-GV Filter, 0.22 µm A 4 mm diameter sterile syringe filter with a 0.22 µm pore size hydrophilic PVDF membrane. Comes in a pack of 100. | Sigma-Aldrich
Millipore Pes Durapore Membrane Filter 0.45um 50mm Microporous Membrane, Lab Filter Membrane, Pes Membrance Lab Supplies - Funnel - AliExpress
Amazon.com: Millipore polyethersulfone sterivex-gp Jeringa Filtro Unit, radio-sterilized, 0.22µm Pore Tamaño, 2000 ml Proceso Volumen, 50 : Industrial y Científico
Filter Membrane, EZ-Pak, 0.22 micron, 47 mm, white, gridded, 600/pk ( Millipore) | Hach USA - Overview