Thanks for the help, Evan. I'll doctor things up to get a better balance. Maybe I won't have to be adding acid quite as often if the water is buffered better. I do usually run the pool at a pH of 7.6. One question though - why so high on the CH?

You asked about the salt - I used one of PoolDoc's test kits for that. I think it's more accurate because when I was relying on the Autopilot last year (too lazy to test), the chlorine just didn't seem to keep up with demand and I had to put the SWCG on the highest power setting. Now, with the higher salt level I put it back down to the "normal" power setting (there are three) and the water has been clean & clear all summer. In any case, it's in operating range as you pointed out; it just seems to run better/more efficiently now. I also read that the Autopilot will read the salt levels with varying accuracy depending on the temperature of the water.