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post #3 of (permalink) Old 08-05-2020, 03:34 PM Thread Starter
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Originally Posted by Mark Fisher View Post
Wipe/scrape some off and put it in vinegar. If it bubbles, it is lime scale. If not, it’s 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 I’m betting on lime scale.
Yeah, you're right. It is moderately hard. I was mistaken. Maybe I should be shooting for a lower gH.

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