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Water is the single largest resource required for crew sustenance during long-term human space missions. To preserve this resource, water must be reclaimed from waste streams containing minimum concentrations of organic and inorganic impurities. The removal of dissolved ions from waste water is essential to regenerative water reclamation technology for life support systems. The aim of this project was to demonstrate a novel electrochemically driven purification method using tubulated bipolar ion exchange membranes for the separation of dissolved ionic impurities from spacecraft waste water. Generally, electrochemical separation methods have limited applications since they can only be applied to the purification of the water that has a sufficiently high dissolved ion content to make the solution conductive. The new method, however, uses a membrane composed of bilayers of oppositely charged ionically conducting polymers.