One out of seven people does not have access to clean drinking water. Since the world population is still increasing, it is a major challenge to meet the drinking water demand of today and tomorrow. Because there are large resources with brackish water, that is, water with a moderate salt concentration, it is attractive to use these for drinking water production. Therefore, energy efficient and cost effective desalination technologies are of utmost importance. Membrane Capacitive Deionization is a robust, energy-efficient and cost-effective technology for the desalination of brackish water.