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Responding to SpaTech...My nomenclature was bad. Â It is not the diverter I am having trouble with, it is the venturi valve. Â To further define the issue, full travel in the clockwise direction should produce a stream of water with no air in it. Â Full counterclockwise travel would put full air saturation in the water. Â There is some slipping going on within the valve which does not allow me to control the flow of air into the water. Â I also do have a grit-getter and my spa is free from debris.Jeff