I have a simple blue pool above ground. 10k gallon. Got the test kit. Pool opened 10 days ago. I have been adding shock and stabilizer, low levels of chlorine. Had tested at pool store yesterday. They gave me liquid chlorine and said 1/3 gallon should do it. Also added some pellets for calcium earlier in the day as water test recommended. I tested this morning...virtually no chlorine after 1/3 gallon. So I added another 1/3 this morning. Left pump on. Tested water approximately 12 hours. No chlorine. What's happening to it? I cannot keep chlorine in the pool. Is it the copper ion simple blue doing this? I am discouraged to say the least.