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Calcium Carbonate a.k.a whiting
Rod:
I've tried using CaC03 to raise GH and KH. It's not a very good idea. The
stuff just doesn't dissolve very well in water and if you use a fine enough
powder, you're going to get milky white water that'll take a couple or more
days to disappear. See my previous post on this topic at
http://www.actwin.com/fish/aquatic-plants/month.200105/msg00150.html.
If you still insist on trying CaCO3, my recollection of my earlier internet
research is that 1/2 tsp of CaC03 will raise the KH of 50 liters of water by
1 dH.
Putting aside CaCO3, it's cheap enough to raise KH. Use baking soda. It's
raising GH that's expensive. I have yet to find an adequate substitute for
Seachem Equilibrium, which is what I use now.
G'luck!
Ming
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