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The process where air and water are mixed. This may be in the form of bubbling air into water, or letting water fall through the air. The process is usually used to increase the oxygen concentrations in water. The efficiency of aeration equipment is determined by the amount of surface area interface between the water and air and the energy required to produce that interface. A summary of the devices used and their corresponding efficiencies is shown in the table. It is also used for other processes such as degassing, mixing and destratification.