The amount of sodium in soft water is directly proportional to the hardness of the untreated water, and for most water supplies it is not very high. For each grain per gallon of hardness, multiply by 7.9 to convert to milligrams of sodium per liter (a liter is slightly more than a quart). For instance, water with 15 grains/gallon hardness will contain118 milligrams of sodium per liter after softening. Thus, 2 liters of water per day provides less than 250 milligrams, which is small compared to the normal daily intake. If you have any health concerns about consuming or cooking with salt-softened water, please consult your physician.