Radium exists as a divalent cation in groundwater, so processes that remove water hardness components like calcium and magnesium are effective. Radium can be non-selectively removed from groundwater via standard cation exchange resins such as DOWEX™ MARATHON™ C (Na) strong acid cation exchange resin. Dow Water & Process Solutions manufactures a distinct ion exchange product designated as DOWEX™ RSC resin that is extremely effective at removing radium and barium from drinking water. DOWEX RSC does not remove other water hardness ions. The RSC resin is not regenerable and it concentrates the radium into a small volume for economical disposal.