This document summarizes a study on the hydrodynamic performance of an adjustable height packed column operating on the principle of an air lift pump. The column is packed with glass rings and operates in a closed water loop with air injection at the base. Water flow rates, pressure drop, gas holdup, and efficiency were measured for different air flow rates and submersion depths. The results show that water flow rate increases with air flow rate and submersion depth. Pressure drop follows a second order polynomial relationship with submersion depth. Gas holdup also increases with air flow rate and decreases with water flow rate. The system provides good mixing with low power consumption and could be used for applications involving heat and mass transfer.