I've had the AquaRite for about 5 years now and the Ph will definitely rise and although you can't stop it, it seems to level out at about 7.8

Rather than fight it every other day, you might let it drift up a bit higher then knock it down to 7.2. For my 20K pool I'm adding acid (1/2 gal) once a week in the heat of the summer. I personally don't think it's critical to keep the ph low and steady as the FC within the cell itself is reportedly 100 ppm~ and my experience has been it sanitizes effectively even if the ph is a hair over.

So I've pretty much learned to relax and enjoy it. Check your water a couple times a week but don't panic to keep it 7.2-7.4, etc. In going on 5 years I've never had an algae outbreak and my water gets 90 in the summer. (My wife likes the heater~)

Hope this helps, Tony