A system for maintaining the depth of injected vapor in an entrochemical system is disclosed. The vapor transfer pathway terminates in the chamber containing high concentration solution underneath the surface of the solution. In one example the vapor transfer pathway is passively adjustable, using a flotation device to maintain the depth of its end. Another example uses an active, actuated system to maintain the depth of the end of the vapor transfer pathway. The energy for controlling the depth of vapor transfer pathway is minimized by passive methods and derives from the heat of mixing of the vapor and the high concentration solution.
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