We put in our in ground pool in 2004, and never had any problems until 3 years ago. Our crystal clear water has vanished, along with our chlorine. To my knowledge, we have done nothing different, but our beautiful pool water is no longer. I found this wonderful TFP site, and have been reading through the comments, and have ordered a pool test kit, should be here Monday the 19th. We are fed up with the pool store we have always relied on - we have been told to add incredible amounts of chlorine, and my wallet has had enough. I look forward to learning what I can here to help us get our beautiful pool back.