MB**2 is a high capacity mixed bed ion exchange resin consisting of a mixture of a gel type I strong base anion resin and a gel strong acid cation resin for direct purification of water. It is suitable for use in regenerable or non-regenerable cartridges, for deionization with high silica removal efficiency and refine water for electrical home applications. It can be used as a stand alone system to produce water quality as high as *4 megohms resistivity (0.*7 micromho/cm conductivity) depending upon the quality of the feed water.