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Global water use keeps rising and by 2050 may be about 30% higher than today. Growing pressure on freshwater resources and the high energy demand of conventional desalination encourage the search for alternatives. One option is freeze desalination, in which salt is separated as ice forms. This method requires far less energy than traditional techniques, and operating at low temperatures limits corrosion while allowing treatment of highly saline solutions. The technology is still under development because salt-reje...