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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...

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...