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So I replaced water and my CYA is now at 70. I have began to SLAM the pool and having issues with the overnight chlorine loss test. Water is clear and CC is 0. I'm losing a lot of chlorine over night, about half of the SLAM target. Does this just mean there is something bad in the water still...

Correct, vinyl liner. I will start draining/ replacing water and go from there. Thank you for the help!

Thank you for the quick reply. I just updated my signature block. I did the diluted CYA test and got 120. How much of the pool would you recommend draining? Everything I have read has said high CYA like that is bad but the pool store said it was fine between 50 and 200?

Hi everyone, I recently purchased a house with an above ground pool (~13k gallons). I'm trying to balance using liquid chlorine 10% and muriatic acid using the K2006 test kit. All I know about pool care is from looking through forums last night. below are my results. After opening: BioGuard...