Seawater desalination is a method for the production of pure water that is being applied more and more. Desalination is performed by only a few commercially competitive processes: reverse osmosis (RO) as a membrane process, and the thermal processes multi-stage flash (MSF) evaporation and multiple effect (ME) evaporation. The ME process is widely combined with thermal vapor compression (ME-TVC), mostly performed by steam ejectors. A few (smaller) installations use a mechanical compressor (ME-MVC), thus consuming only electrical energy for the drive.