This device is highly capable to produce higher purity water without the need of a mixed bed polisher. In many cases, it is able to produce pure water with a conductivity less than 4 microsiemens/cm (Based on feed water conductivity) using only the Cation and Anion beds. This high level of performance is made possible by the rapid and efficient exchange kinetics resulting from the use of fine mesh resins and low resin loading. It has the capacity to remove pesticides, bad taste, color, odors and many other harmful chemical contaminants.