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Thank you Richard, I wish I had contacted you before paying for the CH product I didn't need to worry about. You are the first person who could tell me that I needed to attempt to overcome the problem by adding large amounts of shock. I was afraid whatever was eating up the chlorine would...

I have a 17,000 vinyl pool. I had a pet store test my water for amonia and it registered zero. As I said it did show 10-20ppm nitrates which I tried unsuccessfully to fix with the partial drain. While I don't yet have a good test kit I've been bringing my water to pool stores to test so the...

I'm giving up and closing the pool this weekend. I have had the same problem all year of not being able to keep chlorine in the pool. I can double shock the pool at night and by morning it's gone. I had my water checked and everything was fine. I finally decided to test for nitrates and the...