One thing I can tell you is that there is an SWG by Goldline/Hayward made specifically for AG pools. It's called Aquatrol, I believe. I'm not sure what the difference is, but the cheapest place seems to be ebay. I just bought the inground version for my new gunite pool on ebay for about $400, b/c my builder wanted $1200 to add it to the aqualogic system which I was already getting. A little long winded here, but the aquatrol is the one you want to look for, for AG pools. Lots of info on Goldline's site . . .

http://www.goldlinecontrols.com

-SJohnson