I know the code 91 (low salt) has been discussed many times and I am bringing it up again. I just replaced the electrode at the beginning of the year and it was working great. Now 2 months later I'm getting the same code. I have cleaned the electrode with vinegar. I have tried to get all of the air out. The system will run for about 15 minutes before erroring. I'm not sure what to try at this point.
FC is 3 and decreasing.
Pool is 15000 gallons