Corning ® syringe filters, regenerated cellulose membrane, diam. 15 mm, pore size 0.2 μm 0.2 μm CLS431218 Corning ® syringe filters, sterile, cellulose membrane (surfactant-free with prefilter), diam. 28 mm, pore size 0.2 μm 0.2 μm Z741696 Nalgene ® syringe filter units, disposable, polyethersulfone (PES) membrane, pore size 0.2 μm, diam. 13 mm