Gladden Island is one of the world’s most private islands and is situated in the Caribbean. This private get-away implemented an efficient desalination solution based on reverse osmosis. This solution was installed to guarantee a fresh water supply in the dry periods during which the existing desalination and rain catchment systems proved insufficient. By integrating an innovative energy recovery device that re-uses the pressure remaining in the brine effluent of the reverse osmosis process, this fresh water solution produces 5 m3 fresh water per day while using only 17.5 kWh. As a result this water supply mitigates 10 tonnes of CO2/year in comparison to the former water solution.