Just opened the pool (40x20 in-ground) this week, water temperature is currently 72f. Hayward Salt Generator was reporting 1800ppm at opening. Added 4 40lb bags of Morton's pool salt, and then tested it again 2 days later. Still 1800ppm. I then tested the salt levels with the Taylor salt water drop test kit, 1800ppm. So, it doesn't look like the cell is bad (replaced it 2 years ago). I then added in 2 more bags of pool salt. Tested it 4 hours later (generator and test kit), still 1800ppm.