Most water softeners recharge with table salt or sodium chloride. The sodium ion is what the resin inside the bottle selects, the chloride is fast rinsed down the drain. During the softening treatment of your hard water, the magnesium and calcium ions stick to the resin and are replaced with the sodium. The sodium is much more soluble and and does not cause water marks or streaks. Corrosion is accelerated by chloride ion (think hydrochloric acid, HCl), you can dissolve stainless steel with table salt and vineger. Chlorinated drinking water will cause stainless steel piping to crack and fail. Washing your car with softened water (water that contains sodium carbonate, sodium sulfate) will make it easier to dry without water spots. RO or distilled water is corrsosive because there is no dissolved salts and the water is "looking" for anything to dissolve. Many folks on this board believe the best radiator juice is distilled water and antifreeze, and that is incorrect. It is also their engine and radiator. Seek out the advice of a stationary engineer and ask if he/she uses soft water, deionized water, or distilled water in their boilers. Your physician is concerned about your sodium level increasing and aggravating any propensity for increasing blood pressure. One large glass of water has about as much sodium as 1 slice of white bread. If I was thirsty, I would drink the water. In summary, chloride is bad, causes iron to rust. Soft water is sodium salts of carbonate, sulfate etc. If it tastes salty, it has chloride.
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