Yes, it is gone!!!! I'm trying to raise CYA now. I've had my granddaughters here for the last few days and kept forgetting to do the bucket test. Remembered last night but I think my dog drank water from the bucket as it was way down. I asked my mother (who lives in Birmingham, AL) if she added water every day and she said yes unless it rains. For the sake of discussion, let's say I don't have a leak, just heat and high humidity so I have to add water frequently. I also add lots of salt in the summer...at least a bag a week, maybe more. I need to record that to be sure. Anyway, if I'm adding water almost daily, couldn't that account for loss of CYA and need for lots of salt???