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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.
Outline of the talk. â¢ A global overview of desalination. â¢ The trends of costs of desalination. Introduction to desalination. Â¾97% of the earthâs water is seawater. salt content ~ 35,000 mg/liter. Â¾Domestic water supply requires: Dissolved solids content <1000 mg/l. Drinking water < 500 mg/l. Â¾Desalination refers to the wide range of. technical processes designed to remove. salts from water.