Thorite masonry cement

[aqualab]

I also posted this in the reef discussion thread, hoping to get more feedback - maybe here?
I saw this material mentioned in one of Sanjay's threads as his recommended "cement" for bonding liverock in the making of pillars. Have not had any luck with tracking down a supplier local or otherwise, for this particular product. Is there anything else out there that will work without introducing/leaching chemicals etc. into the tank and still have structural integrity? I am going to do the pillar concept in my new 90-gal bowfront tank, looks great and definitely allows for improved flow/circulation throughout the tank. Just ordered the 1/2" fiberglass rods from McMaster Carr and already have the 1/2" Hilti masonry bit and rotary hammer - just need the epoxy. I was going to go with Marshall Island rock, but looking at its form (open/thin branching mass - kinda like broccoli!) I think I would be better off with premium show size Fiji for its more solid structure and lengths. Might accept drilling of mounting hole and concealing the support rods better. Hopefully, less likely to crumble/fall apart when drilled.

 

[mr.wilson]

King cement products makes a product called "Plugtite" and Quikrete makes a product called "Quikwall" that will work. I've used both of these products with great success. I mix them 50/50 with crushed oyster shell from farm supply stores. This gives the mix a little more strength, shrinkage/crack control, and realism.

If you can't find these in your area, I'm sure you can find some kind of quick-dry, water-proof, polymer-modified cement mix. The manufacturer will give you the specs. Save yourself some trouble, and just tell them it's for a well or cistern. They don't know how to field aquarium questions.

 

[aqualab]

Thanks Mr. Wilson, appreciate the info and the crushed shells idea - I will look for those substitutes you listed.

 

[ratboy]

One thing you need to consider when using cementto bond LR is that the pH is very high and you need to run your tank with fresh water and change it a few times to get the pH stabilized. After a few fill/drains you will be ready to go....

 

[mr.wilson]

There is no PH shift with these polymer modified mixes. The cement sets up before leaching can occur. Regular portland increases PH due to the hydraulic curing process.