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Abstract: Feasibility study of a new water-softening household process by means of ions exchange. Throughout the world, many hydric resources are made up of waters rich in calcium and magnesium called hard waters. Several processes, such as acid vaccination, membrane techniques, are used to reduce the water hardness, as the most used and effective process is the one that uses resins exchanging ions, with sodium ions permutation on sulfonic resin. This paper focuses on the feasibility of a new household ion-exchange process. The resin used was a carboxylic resin with ions H+ permutation, the interest of such a technique being to ensure the calcium carbonate elimination instead of its replacement by sodium carbonate. The exchange capacity and the exchange constant of this resin were determined. The resin was saturated with a 30°F calcic hardness water and regenerated by a 2 mol l–1 citric acid solution. The feasibility of a household ion-exchange process, using citric acid as a regenerating agent, was thus demonstrated. To cite this article: M.A. Dia et al., C. R. Chimie 9 (2006) . [Copyright &y& Elsevier]