Softeners with chronometric or chrono-volumetric regeneration, highly suitable for preventing the formation of limestone in the hydraulic system, caused by hard water. The water passes through a layer of ions exchanging resin, which retain calcium and magnesium, an to replace them with sodium. This totally automatic process allows to eliminate all foulings. All components and the functioning of Walo Professional softeners have been carefully selected, they comply with the most important current regulations on the market and they are environmentally compatible and suitable for food contact materials.