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Muriatic acid is an archaic term for hydrochloric acid. I'm not familiar with the term "gauge" in this context; my best guess is that it has something to do with the concentration. It could be a measure of the specific gravity, though all the weird scales I know of for specific gravity use "degrees" rather than "gauge". It might also be related to "gauge" as a unit of thickness, perhaps as the thickness of a metal plate it will corrode through in a given period of time.

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16y ago

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