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Pool was doing great on the BBB method. Now for the last week it will not hold chlorine. I have shocked it repeatedly but when I check in a few hours, it has dropped 1/2 or more of the FC. I have crystal clear water but I don't like testing in the morning and having an FC of 0. Forgot to...

I have an 18' round above ground pool with a sand filter. For the past three years it has been a nightmare of green water every other week or so. Before I got fed up and found this website the pool guy started me on EZ pool. That didn't work either. So, I want to take charge and do this...