We had a new liner installed this February. After refilling, I guesstimated how much salt to add and I'm showing 3900. I have noticed inconsistent chlorine readings; Some days fine, others no chlorine at all. So I let the pump and SWG run constantly for two days. I tested the water this afternoon and no chlorine at all. No warning lights or codes at all. I just switched it to "super-chlorinate."