Abstract: The invention relates to a device comprising a Laplace power generator acting on a deionizing cell provided with at least one deionizing cell comprising a first element provided with an alternate pile of membranes which are selectively ion-permeable and define concentrating chambers, deionizing chambers and a chamber on each end of the pile, a second element comprising a pile having a number of membranes equal to the first element but said membranes are electrically insulated and extend the chambers of the first element, and a third element provided with two chambers, one of them combining all concentrating chambers and end chambers, the other combining all deionizing chambers.