Cleaning agent
Muriatic acid (use diluted 1st to see if it removes the calcium deposits before trying full strength) - be VERY careful, use eye protection, quality Hvy duty rubber gloves, well ventilated area and old clothes. Flush area well afterwards - since muriatic is an Acid, you can neutralize it with baking soda paste after cleaning the area and washing it well before putting the tank back into service.
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