Without test results, I can only guess at your issue. That said, My guess is that you simply need to take your Cl level to shock value and run your pump and filter 24/7. Your CYA level determines the shock value so I can't recommend how much Cl to put in your pool.....but probably more than you have to this point.
Post test results for, at least, Total Chlorine, pH, Alk, and CYA and we'll get you going.
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