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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.
exists and is an alternate of . Desalination starts out like any other water treatment plant- the water is filtered and treated to get rid of particles, debris, unwanted chemicals, etc. In desalination, this water is then forced through membranes which have holes big enough to let water through but too small for the salt particles.