Raising KH with Calcium Carbonate - The Planted Tank Forum
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post #1 of 2 (permalink) Old 03-26-2013, 01:36 PM Thread Starter
Planted Member
Join Date: Jan 2013
Location: Chesapeake Virginia, US
Posts: 189
Raising KH with Calcium Carbonate

Awhile ago (I wont mention how long) I used to remember how to do this but that knowledge has pretty much gone away through disuse.

How much calcium carbonate (in grams) would I need to add to a liter of water to raise the ppm by X amount (I don't really care what X is but say 10 ppm/L would be a easy number to work around).

My tap water runs about 30 ppm alkalinity and I'd like to raise that up to around 60-80 ppm while raising my Ca levels, thus using calcium carbonate instead of sodium bicarbonate or baking soda. I'll top off the additional calcium I need with calcium sulfate.
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post #2 of 2 (permalink) Old 03-26-2013, 03:35 PM
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Join Date: Mar 2012
Location: New York City, NY
Posts: 352
This calculator:


can give you the CaSO4 in ppm per liter. I'm sure that mirrors to some extent CaCO3 although CaSO4 is hydrated with 1/2 H2O which skews your numbers a bit but it might not mater on this scale.
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