Insane Reefer
New member
I think, simply put, that it says that it makes a cement that is likely to fail.
...it would dissolve within six to nine months within a rock. Nitrate will not accumulate in a new tank within that time
<a href=showthread.php?s=&postid=10622575#post10622575 target=_blank>Originally posted</a> by Insane Reefer
I've sent an email to my guy in England about sulfur - I will report what he has to say.
What do you consider accumulation? My not quite 5 month old Biocube had Nitrates of around 60 before my last water change and adding another rock...
Sulphur: I've never heard of adding sulphur as sulphur (ie: S and not
SO3). Not sure what would happen. If it oxidised to sulphate you would
probably get sulphate attach with cracking and general weakness. If,
not it might just give a yellow mix. Can't see the point myself.
Cement needs a high pH to react. If you lower it you will slow the
hydration. I think you need to think in terms of not mixing anything
into the mix to lower the pH but (if you must) lower it afterwards when
it has hardened eg: with fizzy water.
<a href=showthread.php?s=&postid=10623933#post10623933 target=_blank>Originally posted</a> by mr.wilson
BTW 60 mg/l is awfully high for a 10 gallon tank. Are you doing weekly water changes? Do you have detritus build-up and or a heavy bioload? Do you use carbon, ion exchange resins, or any other chemical media?
How about substituting lime for some of the cement? Lime has a lower
pH than cement (no sodium or potassium hydroxide). Make sure it is
slaked lime - calcium hydroxide. Don't use quicklime - calcium oxide.
Or use a strongly hydraulic lime, ("eminently hydraulic" in European
terminology) as used traditionally for masonry if you can get it. If
not, a blend of 10% or 20% white cement and the rest as lime should be
OK. Obviously, lime is caustic too so take the same precautions as for
cement.
With lime, you should get a purer rock in the sense of a higher calcium
carbonate content compared with cement. It won't be as strong and it
may take longer to set and harden but the final product should be
better, provided it is strong enough. There will be less aluminium as
well. If you use limestone aggregate, you will have a product that is
maybe 90% limestone by the time it has all carbonated.
I feel like a newbie with all this information. I can't wait to read it all.<a href=showthread.php?s=&postid=10641033#post10641033 target=_blank>Originally posted</a> by Insane Reefer
Hey Travis
Welcome to the thread!
LOL