Radionuclide removal from water with Katalox Light® is the most economical way to get rid of 226Ra, 228Ra and 238U in water for Drinking and Water Re-use. During the Filtration of Ground water, Surface Water and waste water, ferrous iron (Fe2+) is oxidized to ferric iron (Fe3+) and raising pH with Katalox Light® forms the insoluble iron hydroxide complex Fe(OH)3. Same way Mn2+ is oxidized to Mn(OH)4, which further forms insoluble MnO2 (Manganese dioxide).