Why is it hard, and costly to remove salt from water?
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It isn’t, on a small scale. It is in fact extremely easy and cheap.
The problem is *just how much water we use*. Farming and manufacturing slurp up water like the id no tomorrow. Irrigated farms use something like 42 inches of water a year. In California, that comes out to about 11 *billion* gallons of water, just for their farms.
It costs very roughly 2.4 kwh to desalinate water at home. That’s $.50 or so depending on your region. Around six billion dollars spent just on desalinating the water for farming.
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