So I converted my pool from baquacil to chlorine and things went fine. The water turned a perfect shade of clear blue. Until 2 days ago...the water turned green. I had converted it july and the test strips always said there wasn't any chlorine in the pool, but believe me...there was. I dumped about 4lbs a day, but dropped it down to a few ounces after the water became clear. However much the book said to put in to raise it from zero to the designated amount. What am I doing wrong? Why is it green?