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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.
The cost of desalting sea water in the U.S. ranges from $1 to $16 per 1000 gallons. br /> Each day almost 10,000 children under the age of 5 in Third World countries die as a result of illnesses contracted by use of impure water. Most of the world's people must walk at least 3 hours to fetch water.