I'm sure the SWG experts (I'm not one!! ) will be by to confirm this soon, but with respect to the rising pH, my understanding is that it is not the percentage of chlorine generated that raises the pH, but rather the operation of the unit itself. So to slow the pH rise, I'd say cut back on the run time. (I'll be interested in the expert's respnses too, because I'm currently taking care of a friend's pool with a SWG and have the same issue)

Janet