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salty than brine. The salt concentration is usually expressed in parts per thousand (permille, ?) and parts per million (ppm). The USGS salinity scale defines three levels of saline water. The salt concentration in slightly saline water is 1,000 to 3,000 ppm (0.1-0.3%); in moderately saline water is 3,000 to 10,000 ppm (0.3-1%); and in highly saline water is 10,000 to 35,000 ppm (1-3.5%). Seawater

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