SiO2 is pretty impervious to just about anything but hydrofluoric acid, which would etch it to where you'd feel the difference. If there was ever any HF in your boiler, it is unlikely that you'd still have a boiler.
Just distilled water and quite a few gallons at that! That’s why I don’t know how if it was anything in it from manufacturing, that any could be left after all of the use it’s had. This may end up being an unsolved mystery.
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