Hello my name is Tony. In late 2013 I bought a 18' round AG pool for my girls. I spent all of 2013 and most of 2014 fighting with it. Well it is new fight and I want to win. I have about 8" of very green water left in my pool. I understand that I didn't have to drain it that much but I wanted a "fresh" start. So here is my question. Do I treat/clean the little bit of remaining water I have left or do I fill up the pool and then treat it. Also what tests are most reliable? My local pool store is Leslie's Pool Store and they offer free testing, is that recommended. Any help with this will be greatly appreciated.