Why is it so difficult to make water drinkable from the salty oceans?
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It takes a lot of energy to separate the salt from the water. Energy is expensive. It’s not that complicated though—one method can even be done at home.
Take salt water. Put it in a heat-proof container with an open top, but don’t fill it too full—leave a few inches of space. Over the salt water container, place a top that slants to one side with the lower end of the slant going past the edge of the container, making sure there is a gap between the lower end of the top and the edge of the container. Cover over any holes with aluminum foil besides the gap at the lower edge of the lid. When you boil the salt water in the container, fresh water will condense on the lid and slide down it out of the gap on the lower edge. This will give you a very basic, very wasteful distillation setup. Using the same equipment as an alcohol distiller will give better results but still take a ton of energy.
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