The salt readings on my Aquarite SWG vary from 600ppm to 3500ppm over 1-2 days. My actual salt level as tested is 3600ppm and has been consistent. My cell is 3 years old, but has been regularly maintained and is clean inside. All wires and connections have been checked and are good. I have "recalibrated" the cell by switching the controller to off, then on, waiting for the click, press the button 5 times, switch to superchlorinate and then back to on. This works for about a day, then it starts over again. The Generate light is on when the reading is above 2600. The salt cell tested OK. Any suggestions you have would be appreciated.