Do you have any idea what your CYA level is? Without CYA in an outdoor pool, it is impossible to keep chlorine in a pool. Do you have a test kit?
Please fill out the information in the following chart. It will help us better to be able to help you.
Pool Chart Entry FormAlso, we suggest getting a good kit. The one we recommend is the Taylor K-2006 or 2006C which you can get through the testkit page in my signature.
Pool Chart Results

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