The main result obtained from the simulations in the osmotic ensemble is that no ions penetrate the zeosils, only water molecules. The non-penetration of ions is therefore used as the main hypothesis for the revision of the law of osmotic pressure presented in this section, by taking account explicitly the nature and concentration of the electrolyte solution. We previously demonstrated that chemical potential of water in electrolyte solutions displays the same dependency in pressure as for pure water, but differ in their vapor pressure -that depends on the nature and concentration of the electrolyte.