Desalination is a complicated and energy-intensive process designed to produce large amounts of potable fresh water from ocean water. Historically the methods most often used was vacuum distillation, where water is evaporated and re-condensed, leaving solids such as salt, sand and other debris behind. Within the last 10 years or so, large-scale desalination has been expanding into the field of reverse osmosis, which is a filtration process that basically strains solids from water using ultra-fine filters. Reverse osmosis is the same process used in small “water purifiers” commonly sold for camping use or to aquarium enthusiasts, but it can also be used on a larger scale.
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