Reverse osmosis desalinator comprising an inlet conduit for a high salt concentration liquid to be treated, a feed pump for supplying said liquid to be treated into one or more filter units comprising at least one osmotic membrane, which one or more filter units are connected to at least one outlet conduit for the permeate liquid, i.e. a liquid whose salt content is lower than that of the liquid to be treated, and to at least one outlet conduit for the concentrate liquid, i.e. the liquid part having a high salt content, with the salt fraction extracted from the permeate liquid dissolved therein, and which concentrate liquid is to be discarded, further comprising at least one energy recovery device for recovering the kinetic and/or pressure energy of said concentrate liquid at the outlet of said one or more filter units, wherein said energy recovery device further consists of at least one hydraulic turbine at the outlet of said one or more filter units, which hydraulic turbine is mechanically connected to drive an auxiliary pump at the inlet of said one or more filter units and connected in series with said feed pump.
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