Abstract: A high capacity chlorine dioxide gas generator includes an anolyte loop for generating chlorine dioxide gas and a cooling system connected to said anolyte loop. A chlorine dioxide solution generator includes a chlorine dioxide gas source, an absorption loop fluidly connected to the chlorine dioxide gas source for effecting the dissolution of chlorine dioxide into a liquid stream, and a cooling system that functions in the chlorine dioxide gas source or the absorption loop. A method of generating chlorine dioxide solution includes providing a chlorine dioxide gas source, dissolving chlorine dioxide into a liquid stream using an absorption loop fluidly connected to the chlorine dioxide gas source, and cooling the chlorine dioxide in at least one of the chlorine dioxide gas source and the absorption loop.