The Planted Tank Forum - View Single Post - bringing up Kh ,do I use CaCO3??
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post #5 of (permalink) Old 01-03-2003, 06:10 PM
Jim Miller
Planted Tank Enthusiast
Join Date: Dec 2002
Location: Maryland
Posts: 531
Calcium carbonate works as well as baking soda. If both GH and KH are low I'd add CaCO3 to get both up. CaCO3 will raise both an approximately equal amount. Once the GH is where you want (target 4 or so) then add baking soda if the KH is still a bit low (also target 4 or so).

CaCO3 is available in tablet form in drug or nutrition stores as a dietary supplement.

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