We opened our pool last Saturday. It was a green algae mess. In the last six days I have added so much chlorine because my test kept saying that I still had combined chlorine. My chlorine level is greater than 50 but yet it still says I have combined chlorine. What am I doing wrong? I took a sample of water to the pool store just to see what they came up with and they said my chlorine was off the charts and they couldn’t read it. I know that I have no CYA my pool, even though I have added shack and some talks too I took a sample of water to the pool store just to see what they came up with and they said my chlorine was off the charts and they couldn’t read it. I know that I have no CYA my pool, even though I have added shock in some parks too. We had issues with a high CYA in the past and I don’t want it to go to high again. How can my chlorine be so high and still have CC?