Other 18″ Air/Water Column Applications: VOC removal, hydraulic and mass transfer testing of packings and trays, mass transfer measurements, CO2 scrubbing Construction: 350 gallon recirculation tank Column Diameter: 16.8 in Pressure 0 -2 psia Packed Height: 10 ft Air Rate: 50 – 1,500 SCFM Water Rate: 2.5 – 40 gpm/ft2