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desalinization plants. drink processed seawater.
Exceedingly expensive and not particularly practical.
The cost of the energy and the maintenance is prohibitive.
The waste - the amount of water that goes through the system to produce much less drinkable water is inefficient.
As far as I know, no one is using such a system for irrigation or other water purposes, only for potable water. Water we using for drinking is a small percentage of our water use.