Ladd,

Do you have afull set of test results you could post including the following?
Free Chlorine (FC)
Combined Chlorine (CC)
pH (pH)
Calcium Hardness (CH)
Total Alkalinity
Cyanuric Acid (CYA aka stabiliser)

My guess is that you have high calcium hardness and/or high alkalinity that is/are causing the scaling on the cell.