When done in large quantities, the salt water is not completely evaporated, just most of it, and the salt rich water left over is flushed out back into the ocean. So fish need to drink lots of seawater to stay hydrated. In some areas, salt water (from the ocean, for instance) is being turned into freshwater for drinking. Scientists in the US have developed a membrane-free, solvent extraction method to remove salt from seawater that works at low temperatures. The spray adheres firmly to glass, so you'll need to dissolve the salt with basic household supplies. But it is unlikely to have any impact on a global scale, said a spokesman from national water agency PUB. This process involves evaporating the water leaving behind the salt. If all the salt dissolved in the ocean disappeared instantly, then the oceans would convert into a giant freshwater body, which would have the ability to feed the humanity freshwater for a really long time. This gives you an idea of how much salt … Unfortunately, supply is becoming over-stretched and there is a struggle to meet demand. By some estimates, if the salt in the ocean could be removed and spread evenly over the Earth’s land surface it would form a layer more than 166 meters (500 feet) thick, about the height of a 40-story office building. Desalination Breakthrough: Saving the Sea from Salt A chemist finds a way to cut supersalty discharge and CO2 as the Middle East relies ever more on … The "simple" hurdle that must be overcome to turn seawater into freshwater is to remove the dissolved salt in seawater. Answer 5: Good question. Salt is removed from sea water in a process called desalination. Most fish that live in the ocean tend to lose water--the high salt content of the ocean causes water to constantly flow out through the fish's gills. Unfortunately, those who live in coastal areas must combat the sticky ocean spray that smears windows. 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