Corning 430767 Polystyrene Vacuum Filter/Storage Bottle System, Graduated, Sterile, Cellulose Acetate Membrane, 0.22 Micron, 250mL Capacity (Case of 12) Cellulose acetate (CA) membrane has a 0.22m pore size and a 19.6sq cm area to provide a fast flow rate and low protein binding; good for filtering cell culture media Graduated funnel and storage bottle have a 250mL capacity and 45mm neck diameter; receiver bottle features easy grip sides for improved handling Includes a sterile plug-seal style orange high density polyethylene cap; angled hose connector simplifies vacuum line attachment Individually packaged, sterile, and certified nonpyrogenic; designed for filtering and storing cell culture media, biological fluids, and other aqueous solutions