Abstract: To be competitive in the deregulated market, power producers are looking for ways to lower operating costs while maintaining a reliable supply. To this end, many plants have investigated innovative technologies for boiler make-up water treatment. One such technology is the combined reverse osmosis (RO) and electrodeionization (EDI) system. While this system offers several benefits, its operating costs and lack of operating experience in power plant applications make it unattractive in certain cases. Another water treatment technology, short-bed demineralization, combines the low cost, proven reliability, and high performance of conventional mixed-bed ion exchange with many of the benefits of RO/EDI systems.