As an example, the largest unit so far constructed by Sidem using this process is described: a 1,500 m**3/d unit installed in the Nuclear Power Plant of Flamanville in France, which supplies a high quality water to that plant. The advantages of this process are outlined, compared to other distillation processes: multiflash and ejectocompression, and the series of mechanical vapor compression units that Sidem has developed in a size range between 25 and 2,500 m**3/d is also presented.