I'm sure this has been discussed but I did not find it when I did a search. I used a digital TDS sensor to determine if my ten year old house softener was working correctly. I'd been seeing some green powdery stuff around some faucets. The powder comes from me not cleaning as often as I should and is from the copper plumbing. After the TDS sensor tells me the water coming from the softener is just as hard as the water going in I replaced it and still got the same readings. Well, dummy me, TDS will be the same from artificially softened water since the calcium and magnesium ions are simply replaced with salt! I replaced a perfectly good softener. A hardness strip test confirms my new softener is working and the TDS readings are the same. Incidentally, the TDS is around 148.
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