View Full Version : Calcium Carbonate Source

07/21/2008, 08:31 AM
Hello all,

I was hoping to get some feedback on a finely ground limestone product that I have access to in abundance. Here is the chemical analysis and I would appreciate it if anybody could comment on these numbers and whether or not this material would be beneficial for a reef tank.

Calcium, %: 24.58
Calcium Oxide, %: 34.39
Calcium Carbonate, %: 61.38
Magnesium, %: 9.64
Magnesium Oxide, %: 15.99
Magnesium Carbonate, %: 33.44
Iron Oxide, %: 0.23
Aluminum Oxide, %: 0.27
Silicon Dioxide, %: 4.12
Calcium Carbonate Equivalence, %: 100.19

Yes, I know, I have no life. When I look at rocks I think how can this help my tank.

Randy Holmes-Farley
07/21/2008, 08:34 AM
How would you be using it? In a CaCO3/CO2 reactor? As a sand substrate? As "artificial" live rock?

07/21/2008, 08:39 AM
I was looking at it in terms of a reactor. I don’t have any specific use for it at the moment, I just always see folks looking for a source of calcium for diy 2 parts and what not. Plus I look at the stuff all day long as I sell rocks for a living.

Randy Holmes-Farley
07/21/2008, 08:46 AM
It looks a bit heavy on magnesium to use in a reactor, IMO, but people do use bulk limestone for that purpose when the magnesium looks lower.

07/21/2008, 08:49 AM
What about as a one time additive to get calcium and mag up?

Thanks for looking at it by the way. As I said I don’t really have a specific use for it I am just curious especially since it would be so cheap.

Randy Holmes-Farley
07/21/2008, 08:57 AM
No. It will boost alkalinity too much to usefully raise levels of either calcium or magnesium.

07/21/2008, 09:01 AM
Oh well. Thanks for looking at it Randy.

Randy Holmes-Farley
07/21/2008, 10:38 AM
You're welcome.

Happy Reefing. :)