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Using a tap for .....water?

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You sure it was actually calcium carbonate also known as limestone?
 
It's not hard to dissolve CaCO3 in water when you bubble c02 through it.
http://braukaiser.com/wiki/index.php/Building_brewing_water_with_dissolved_chalk

I would never use it for brewing (bubbling c02 through it, and having it precipitate out again or adding an acid just to dissolve it) but I have two uses for it now. One, I use it to make a homemade remineralizing toothpaste, and two, carbonated water!
 
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