Kh concentrate - The Planted Tank Forum
Old 09-01-2012, 01:10 AM Thread Starter
Algae Grower

Join Date: Aug 2011
Location: arlington, tx usa
Posts: 79
Kh concentrate

Can anyone help me with figuring out how much calcium carbonate to add to 1 gallon of water. So that when I dose 5 ml it will increase 10 gallons of water by 17ppm kh. I am not that good with these kind of numbers. I tried the fertilizer calculator but they would not work for this.

Thanks Todd Ziegler
Always question those who claim to have the truth!
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Old 09-01-2012, 04:59 AM
Planted Tank Guru

Join Date: Jan 2010
Location: Contra Costa CA
Posts: 11,721
Lets see...
"Two teaspoons (about 4 grams) of calcium carbonate per 189.3 Litres (50 US G.) of water will increase both General Hardness (GH) and Carbonate Hardness (KH) by approximately 1 degree" (Wiki)

So for 10 gallons, this would be 1/5 of 2 teaspoons, or a scant half teaspoon.

You want to make a stock solution so that 5 ml will have 1/2 tsp of CaCO3? I do not think you can make it that strong. Try, and start with RO or DI, and you might get more of it to dissolve if you add something acidic to it. Maybe use peat tea. I think you will have to adjust your dosing.

Another option:
If you want to dose 1/2 teaspoon of dry CaCO3 in a 10 gallon tank, put that much in a cup or two of water (RO or DI, or peat moss tea) and shake it like crazy until it is dissolved. It does not dissolve easily.

Another option:
Find another source of carbonates that does dissolve fairly easily. For example:
1 teaspoon of baking soda added to a 29 gallon tank will raise the KH by about 2 German degrees of hardness, or 36 ppm.
so... 1/2 tsp in 29 gallons = 1 degree
so... 1/6 tsp in 10 gallons = 1 degree

Try adding 1/8 tsp and let that work overnight. It dissolves fast, but let it get well circulated before you test. I would add that much directly to the 29 gallon tank, dry, right into the flow from the filter.
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