The process of obtaining fresh water from seawater is called desalination. The desalination methods used are seawater freezing, electrodialysis, distillation, reverse osmosis and ammonium carbonate ion exchange, with the application of reverse osmosis membranes and distillation being the mainstream in the market.
     Desalination is the use of seawater desalination to produce fresh water. It is an open-source incremental technology to achieve water resources use, which can increase the total amount of fresh water, and is not affected by time and climate, has good quality and is gradually becoming more reasonably priced, and can guarantee a stable water supply for coastal residents such as drinking water and industrial boiler make-up water. The process of obtaining fresh water from seawater is called desalination. 
    Desalination is mainly used to provide water for drinking and agriculture, and sometimes edible salt is also produced as a by-product. Desalination is popular in the Middle East and is also used in some islands and on ships.