I have a pool pilot digitl 220 with a sc-48 cell. I have been having trouble all summer keeping my fc level up. I been having to supplement my santizer for a couple of months now. I've added probably close to 14lbs of stabilier/conditioner and still can't keep my fc up. I opened up my cell today to check for scaling (first time since May) and there were brown marks on the inside of the cell wall and a small amount of scailing. this is my second season with the pool and salt system. If anyone can tell me what this is I would really appreciate it. My current readings are
I have a 20,000 free form Plaster pool. A little over 1.5 years old.