Apparently I shoudl ahve used google !
In theory, calculation shows that 1 kWh is enough to produce one ton of fresh water from seawater. However this assumes a perfect thermodynamic and mechanical system which is not possible to build. In practical terms a desalination system will require 7 to 18 kWh/m3 depending on the corresponding investment.
Why pay $1515 per month ?
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Prime discounts available.
Recent investments will yield a slight profit.