C.C.
We just had our (in ground) pool re-plastered this weekend, and I had to go in to Leslie's pool supply to pick up a wall brush among other things. Anyway, I noticed that they had a sign there that said that you could bring in a sample of your water, which they will analyze and then they'll tell you exactly what chemicals you need to add in order to get your pool water clear again. Apparently if it doesn't work, they will refund the cost of your chemicals! So, if there's a Leslie's near you, you might want to try them. At least that takes the guess-work out of it. :) Good luck!