Concrete to raise pH??

[Ermin]

Now here's an idea...just wondering what are the drawbacks.....

I know GARF advocates "aggrocrete". Bascially its just concrete mix with substrate. They say to place the product in fresh water until the pH drops to acceptable levels, about 8 before putting in tank and can substitute for live rock. Nevermind the liverock issue they claim...just taking the factual pH reading of concrete....

If your tank is low in pH and the concrete starts at 12+ pH. Would placing a small chunk of the concrete in the tank even out the pH?? ie. concrete 12 pH + tank water 7 pH = final reading 8 pH? Obviously it is not going to be a huge block of concrete, but a small piece?

There are many reasons for low pH and this won't solve the cause. It will target the result and not the cause. For raising pH fast, is this method even valid? Just a crazy idea for raising pH??

[Tank]

If it would work , there would be a ton of math involved. How much does x amount of this compound raise the ph of x volume of water. What is the rate of the compounds ability to raise ph. Meaning how fast does it lose the ability to raise ph. In other words, it aint worth the effort involved, especialy when there are products out there that acchieve the same goal.

[scubadude]

Ermin,
In essence yes you can raise the PH this way, however what concerns me more is the leeching of phosphates, and other unwanteds in your system. I have made/used aragocrete many times and will not risk my systems w/uncured manmade rock.

[icemark]

I agree with Scuba... there are other things like metals that are leaching from the concrete as well as the high PH as it cures, I would not trust it uncured in my tanks.