With the majority of research on porous carbon electrodes over the past decades dedicated to capacitive energy storage devices, capacitive deionization had been somewhat overlooked. Though the application of porous carbon electrodes for water desalination had been documented since the 1960s when it was called “electrochemical demineralization” or “electrosorb process for desalting water” [3], [4], [5], [6] and [7], only recently the academic interest in this technology increased exponentially, and companies have begun marketing commercial CDI technologies.