Brinergy successfully installed and tested in the field its first proprietary capacitive deionization (CDI) system. This was the first commercial-size CDI prototype for fluoride rejection. Our system integrates CDI electrodes developed by LLNL and Aquas Tech. The system was installed at Emmasa, the largest water company of Santa Cruz de Tenerife, Spain. The solution proved to be the best available in the market for fluorides removal in terms of water and energy efficiency and operating cost.