joining rocks with rods... what type is good?

[hawk]

Originally Posted by Reefer Rob

Thoroseal looks interesting, where can you get it in Canada?

I looked for it awhile back and had no luck. I eventually used another hydraulic cement I got from Rona (King Quick-Plug). I sent the msds to Randy Holmes-Farley at RC, he couldn't see any ingredients that would be a problem. Depending on how much you use and how big your tank is, it can elevate ph like any cement will. When using it to secure rocks you don't use very much so at least in my case ph didn't rise at all.