Water produced by the process of demineralization, softening by cationic ion exchanger, from which all dissolved gases, salts, acids and bases, and some dissolved organic matter are removed. This method completely separates Ca and Mg cations, which generate a limescale. It is intended for the accumulators, vehicle cooling systems (water/antifreeze), for an iron, inhalers, etc.. It can be used in industry and laboratory, as a coolant and a solvent, for heating and rinsing, in chemical industry, etc.