Just wanted to note that I am usually against the use of flocs/clarifiers myself, but having had a messed-up pool from filter blow-back for almost 3 weeks that no amount of vacuuming/shocking would fix, the clarifier I used was a last resort. The problem I had at the time was that the stuff was too fine for any filtering to get it out. So--that's why I suggest that you try the shocking first, to eliminate the possibility of algae. If shocking doesn't change anything, and your other numbers remain in line, then it might take a clarifier to remove the reallly fine stuff from the pool.

That being said, I agree with Carl in that if you're going to drain the pool, go ahead and do that before adding anything else to it.

Janet