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Uploaded on Jan 3, 2012
To supply air to 2, 3 or 4 airlift tubes from a one outlet bubble pump, you must restrict the airflow to each column. This one has 16 inches of submergence and it uses 3 t-joints to let the air into the airlift columns and pump the water. Notice that the water plugs are much slower than a typical windowfarm and there is hardly any noise from the airlift. The noise all comes from the bubble pump.