Recovery of water to a purity that allows use by the community is a boon for all.  The recovery of mineral wealth from water has been done, even to the point of exploring recovery of gold from seawater (although I suspect the economics of that may not have "panned" out.)  Obviously, the economics of such a plan depends on the volume of water to be "mined", the concentration of the resource in the water, and the ease of extraction of the resource.  If all it involves is a simple ion exchange reaction, then it can be fairly economic, as long as the water can be further treated and used as a valued resource itself.

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Recovery of water to a purity that allows use by the community is a boon for all.  The recovery of mineral wealth from water has been done, even to the point of exploring recovery of gold from seawater (although I suspect the economics of that may not have "panned" out.)  Obviously, the economics of such a plan depends on the volume of water to be "mined", the concentration of the resource in the water, and the ease of extraction of the resource.  If all it involves is a simple ion exchange reaction, then it can be fairly economic, as long as the water can be further treated and used as a valued resource itself.