Thanks chem geek - I had pretty much come to the conclusion I must be experiencing what you are describing. With fear and trepidation I went ahead and added the bleach like I described - an hour and a half later I still had basically no FC but the CC was down to about 2.5. So I added some more and will check again in 30 minutes, i sure hope i am not destroying my liner. We did have it closed professionally? at the close of last season - I wonder if they forgot a step?