An electrodeionization apparatus and method for purifying a fluid. A fluid, such as water, can be purified by removing weakly ionizable species from the fluid. Weakly ionizable species may be dissociated at different pH levels to facilitate removal from the fluid in an electrodeionization device....http://www.google.es/patents/US6824662?utm_source=gb-gplus-sharePatente US6824662 - Electrodeionization apparatus and method
