Corning 431098 Polystyrene Vacuum Filter/Storage Bottle System, Graduated, Sterile, Polyethersulfone Membrane, 0.22 Micron, 1000mL Capacity (Case of 12): Science Lab Bottletop Filters: Industrial & Scientific. Corning 431098 Polystyrene Vacuum Filter/Storage Bottle System, Graduated, Sterile, Polyethersulfone Membrane, 0.22 Micron, 1000mL