This is our third season with our 18x32 above ground pool. This spring, we decided to try out the Frog system that everyone said we "had to have". Well, this has been the toughest season yet. I can not seem to find the perfect setting to keep it at to keep it clear. About 3 weeks ago I final got the 'crystal' looking water that I used to have last year, but I have it set the Frog at 9, while still shocking it. That seemed to work until I got up this morning to cloudy water again. I checked to make sure filter was clean, it was fine, but after only 2 weeks, my bac pac was empty. I do keep my solar cover on a lot to try to keep heat in , as we are in Michigan, but was told that shouldn't matter much. I am not under any trees, and we swim between 4-5 times a week. Does anyone know why it is taking so much to keep my pool clear? Any suggestions would be appreciated.