Filtration units with PES membrane, Ø 50 mm, pore size 0.1 µm, 250 mlFiltration units with PES membrane, 50 mm, pore size 0. 1 m, 250 ml Sterile Disposable filtration unit with hydrophilic polyethersulfone diaphragm (PES). The innovative Rapid Flow design of the filter membrane carrier plate provides faster flow rates and higher flow volumes. The PES membrane with minimal protein binding and a minimal proportion of extractable substances is ideally suited to biological sterile filtration of cell culture media, sera,