View Full Version : pumicie stone reefsafe?

02/27/2008, 05:44 AM
Hi, does any one know if pumice stone is ok for a reeftank.

John. :)

02/27/2008, 07:32 AM
I do not believe it is, as it tends to be acidic. Anectodately, I have also not seen it used before.

02/27/2008, 07:55 AM
I wouldn't se pumice stone in the tank. The stone is know for being really acidic. It will mess the parameters in your tank.

02/27/2008, 02:20 PM
I was planning to use it with portland to create a more lightweight rock onstead of using salt.
Not sure if you know what makes it acidic but the cement would counter act this I guess. I have looked at the chemical analysis and it we have:

SiO2= 72%

Al2O3= 12.75%

Fe2O3= 1.3%

K20= 4.3%

CaO= 0.7%

I did use to use a pumice rock ( I think ) for filter medium but this was over 10 years ago ( it was sold as a filter medium that could denitrify b4 DSB's and plenums )and would be interested if anyone has also used this or is using presently.


02/27/2008, 03:18 PM
Isn't one of the properties of pumice that it floats???

Or am I just using a generalization????

02/28/2008, 08:39 AM
Yeh think so, was planning to use it for a cement formula....

wayne in norway
02/29/2008, 02:10 AM
Interesting you quote the composition as % of oxides, when the stuff is in reality made of silicate minerals - those percentages need reworking to the 'real' mineral composition. Thus the high Si=s of course