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Re: Calcium carbonate

Coral chips(don't adjust quickly nor dissolve fast either)
Aragonite, a bit faster, especially if you use the fine
powder/sand grain size.
Dolomite will also add Ca, CO3 and Mg. 
Get the fine ground grain sizes. Ag feed stores etc and LFS's
sell these.  

You can also use baking soda(for KH) and CaCl2(Home Depoit had
some for your pool to increase Ca levels) for Ca if you want
something that dissolve within a few minutes. If you also need
Mg, MgSO4.7H2O Epsom salt works well.

Tom Barr 

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