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Re: Increasing CaCO3 solubility

> From: Carlos Gallego <carlosag at mx2_redestb.es>
> Date: Wed, 19 Mar 1997 19:06:33 -0800
> Subject: Increasing CaCO3 solubility
> I am using CaCO3 to increase the KH and GH of my tap water, added in
> each water change.
> When I add it to the tank, it becomes very cloudy, taken about two or
> more hours to clear (I am adding CaCO3 to increase hardness in 5 dKH and
> 5 dGH).
> I have read in past APD that CaCO3 has low solubility in water and it
> has to react with the CO2 in the water to be disolved. My question is,
> is there any form to help CaCO3 to disolve in the water or to increase
> the reaction speed in order to get the tank clear early?
> Carlos Gallego
> E-mail: carlosag at mx2_redestb.es

You might try adding Calcium chloride (CaCl2) and Sodium bicarbonate.
--if you can stand to increase the sodium chloride content of the water.
These should dissolve very fast and not precipitate calcium carbonate.
As far as I know, there is no solid calcium bicarbonate.
Curtis Hoganson
Dept. of Chemistry, Michigan State University
East Lansing, MI 48824   517-355-9715 ext 260