you're welcome
AquaTrol was the only SWG marketed for AG pools that I came across during my search. I am not exactly sure how it differs from the AquaRite or other SWG's, or what makes it "AG" and the others "IG".
If you find out other info on either this or other AG SWG's, let me know. I am still sitting on the fence on the salt issue, though I would love to fall over onto the salty side! In any case, I still have a bit of time to decide.