Lewatit® NM-91 is gel type, high capacity, high purity mixed ion exchange resin prepared with a unique volumetric ratio of 55% gel, strong acid cation resin, and 45% gel, Type 1 strong base anion resin. Lewatit® NM-91 is specifically designed for water demineralization applications with high alkalinity or high FMA ratios, where complete removal of silica and CO2 is not required. The resin mixture is designed for non-regenerable application. lt also can be used for demineralization of service water, waste water and water recovery in small units and once-through cartridges