Table Salt in Gray and Black Tanks?????
We are currently staying in a very hard water area. We DO NOT use our Fresh water tank but last year our gray and black tanks got a hard water residue on them and would not register correctly. I go...
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Incorrect gauge readings were probably not a result of the hard water. Those gauges are notorious for giving bad readings frequently. You could try the Geo method (google it), but you'll still most likely have incorrect gauge readings from time to time, if not constantly.
