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The amount of sodium added to water from soft water systems depends on how hard the water supply was before the process began. Very hard water (more than 10 grains of hardness per gallon) requires only 20 to 40 mg of sodium to be added to every 8 ounces of water. If that sounds like a lot, consider this: an 8-ounce glass of low-fat milk contains about 120 mg of sodium, a 12-ounce can of diet soda contains from 20 to 70 mg, and an 8-ounce glass of orange juice contains about 25 mg.