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Nevermore · 04-08-2009, 01:49 PM

Hi zdam20,

This site should give you the info you need: http://www.rexgrigg.com/waterchem.htm

Basically, to raise the KH with Calcium carbonate, you will add 69 grams to your 150 gallon tank. That will raise the KH (as well as the GH) by 2.75 degrees.

I would question why you think you need to raise the KH. I think your thinking might be wrong; it sounds like your using the CO2-KH-pH chart to come to the conclusion that you need to add KH and that is wrong. You can't change KH or pH to adjust your CO2 level. Also, see this: http://www.aquaticplantcentral.com/f...-amazonia.html

04-08-2009, 01:49 PM	#2 (permalink)
Nevermore Senior Member Join Date: Mar 2007 Location: Here, for the moment Posts: 354 iTrader Ratings: 12 iTrader Positive Rating: 100% Plant Points: 22450	Re: CaCO3 for alk Hi zdam20, This site should give you the info you need: http://www.rexgrigg.com/waterchem.htm Basically, to raise the KH with Calcium carbonate, you will add 69 grams to your 150 gallon tank. That will raise the KH (as well as the GH) by 2.75 degrees. I would question why you think you need to raise the KH. I think your thinking might be wrong; it sounds like your using the CO2-KH-pH chart to come to the conclusion that you need to add KH and that is wrong. You can't change KH or pH to adjust your CO2 level. Also, see this: http://www.aquaticplantcentral.com/f...-amazonia.html Last edited by Nevermore : 04-08-2009 at 10:26 PM.