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I have a 15' above ground pool. One side is almost 2" lower than the other. It has been like this since for years and hasn't gotten worse. However the liner is showing some strain, with wrinkles running toward the lower side and some wrinkles around the skimmer port. There are no apparent leaks...

CYA was very low as tested at the store and they recommended stabilizer. My home test strip shows less than 30 but more than 0. (I have a real test kit on order)

so, i should add stabilizer and more liquid chlorine ?

A follow up:I took water to the pool store for testing. It showed very high total chlorine and almost no free chlorine. Does this make sense? What should i do to bring it to the right level and ratio? The pool is still clear

Thanks for all your help. This forum is very informative and prompt

Thanks. That would explain why it was on sale! I have some powdered shock left over from last year (at least). does this also go bad over time?

Thanks for the quick replies! The chlorine (purchased yesterday) is dated 9/5/2015. Is this outdated? I noticed it does not have a strong bleachy smell as i would think. The water was light green but is now cleared after running the filter and vacuuming. There is still quite a bit of stuff...

I opened my 4500 gal above ground pool and added a gallon of 12% liquid chlorine. After circulating a while, the test strips show no free chlorine. So, i added a second gallon. Same result. I've never seen this. Usually one gallon is fine to start the summer. Any ideas? is the chlorine bad or...