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But desalination is expensive. A thousand gallons of freshwater from a desalination plant costs the average US consumer $2.50 to $5, Pankratz says, compared to $2 for conventional freshwater.ut desalination is expensive. A thousand gallons of freshwater from a desalination plant costs the average US consumer $2.50 to $5, Pankratz says, compared to $2 for conventional freshwater.
This, factor should have a smaller effect in RO water desalination. The results show that increasing the I.R. from 0% to 5% will only increase the water production cost by 0.7 cents/m 3 (0.71%), which is a very small amount.