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The desalination of seawater and brackish water has experienced a significant surge, mainly due to improvements in reverse osmosis technology and energy recovery systems.

Elmasa Tecnología del Agua is a company specialising in water desalination. In 1986 the company pioneered the brackish water desalination plant using electrodialysis reversal (EDR) in the Canary Islands. Just two years later, in collaboration with other companies, Elmasa implemented the project of a seawater reverse osmosis desalination plant in the same municipality. Elmasa has carried out all kinds of design and construction works involving desalination plants at all their stages: water collection through underwater emissaries with open or closed intake, water pre-treatment (sand filtration, ultrafiltration), reverse osmosis, product water post-treatment and underwater emissaries for brine discharge.