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I have a 20,000 gallon inground pool with a chlorinater that I keep tablets in regularly. We've never had an issue this whole summer with the chlorine levels dropping to zero. The numbers I provided above are from today. Also, it's a vinyl liner pool.

My pool chlorine level dropped to zero all of a sudden. Last week I added a gallon of liquid shock the level was a little low. It brought it up. I had the water retested this past Tuesday and the FC was 0 and the total chlorine was .3 and the water was a little cloudy. this seems to have...