When I installed my Autopilot is was preset to power level 3, 50% run time. I started adjusting it down 4% at a time. Got to a point that I had to change to power level 2 and started at 50% runtime. Started adjusting down again. It runs at level 2 and 43% for 85 degree water temp, 2.5FC. I did it slowly over about 2 weeks. Ran the system for awhile checking for scale on cell. Bumped up the reverse time and left it there checking for scale. Ended up at max time between reversal. I still haven't had to clean the cell.
22000gal, cell 48