Doug, I can't help you out with names too much. I used to get it from the Ilderton Co-op, but it's not always available now since it was bought out and turned into a hardware store with farm supplies.
My last bag I bought in Strathroy but I don't remember the name, only how to get there.
Originally the brand name on the bags was Beachville Lime and I wrote to them before buying to be sure there wasn't anything that would cause my tanks to fail. I then used some only in a small tank for about 6 months until I was sure it would give me no problems.
Beachville supplies the lime now but it is bagged under another name that I don't remember.
It did say "hydrated lime" on the bag, but I dump the contents into I.O. salt buckets and throw the bag away so I can't tell you what else is on the bag.
Just go to a farm supply store and ask for Hydrated Lime that the farmers use as a disinfectant.
I'm more than halfway through the third bag since I started. I sell some and use the rest in all my tanks. (550g plus sumps)
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