Using a tap for .....water?

[Vale71]

Yes, but it can take quite a long time.

 

[Horseflesh]

It seemed to work fine at about a gram per 5 gallons. Haven't tried a more mineralized recipe yet.

 

[Vale71]

You sure it was actually calcium carbonate also known as limestone?

 

[Yooper]

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!

 

[Horseflesh]

You sure it was actually calcium carbonate also known as limestone?

"Calcium carbonate" is right on the bag. I bought it for making beer a long time ago when I just started reading about water adjustments, before I knew it was a poor choice for that purpose.