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Calcium deposits in tub..?

What are the calcium deposits from my tub from?

Sir Bobby Mclairy III
N/A - tallahasse Fl US

Either there is calcium in the city water supply which is precipitating out because of the different temperatures and exposure to carbon dioxide in the air, or a former resident disposed of a body by dissolving it in acid, and the calcium from the bones is overflowing back up from the drainpipe.

Ted Mooney, P.E.
finishing.com
Brick, New Jersey

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