You can check the price history of Corning 430756 Polystyrene Vacuum Filter /Storage Bottle System, Graduated, Sterile, Cellulose Nitrate Membrane, 0.22 Micron, 250mL Capacity (Case of 12) here.
Cellulose nitrate (CN) membrane has a 0.22m pore size and a 19.6sq cm area and is good for filtering buffers where protein binding is not a concern
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
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