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post #2 of (permalink) Old 08-05-2020, 04:46 AM
Mark Fisher
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Wipe/scrape some off and put it in vinegar. If it bubbles, it is lime scale. If not, itís just salts from the evaporated water (e.g., sodium, potassium, chloride, sulfate). I consider water with GH 7 to be moderately hard, not soft, so Iím betting on lime scale.
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