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Desalination plant will cost approximately $1 billion. the freshwater pumped ten miles underground to a regional delivery system providing water to an additional 300,000 san diego county residents. customers won't know whether they're drinking desalinated water or not? >> that's right. it will become part of the overall supply. >> reporter: through a process called reverse osmosis, the plant will convert every two gallons of seawater into one gallon of fresh water, filters out 99.9% of the salt. the salt, or brine, that's removed, is discharged back into the ocean. the desalination process tra...

The desalination process traditionally takes a lot of energy. a plant this size would normally use as much energy in a single day as 70 homes in a year. officials at the carlsbad plant say theirs will use 46% less energy. the project is not without criticism. environmentalists point out that desalination requires a lot of energy and brine discharge can negatively impact marine life. >> creating more marine wetlands in san diego bay to create new has been tbitat to reproduce. we dilute the brine with sea water before it leaves the site. >> the plant is expected to be completed in 2016. >> and e...