Cloudy water after shocking. High Chlorine level.

Hi, I'm new to this forum, so still getting the hang of things. I have a 15,000 gallon above ground pool that has been fairly clear throughout the summer. I went out of town for a week or so and left the pool in the hands of my fiance. It was storming a lot last week, so I expected it to be a little green. But since then, the chlorine levels have been really high (She may have shocked it too much and added too much chlorine), and I cannot get the pool to clear up. My levels are below:

FC: 10
TC: 10
AK: 80
PH: 7.2
TH: 0-100

I am backwashing and cleaning everyday, all the while continuing to add more fresh water. I have a good working sand filter with new sand. I've read about floccing, is this something that I should consider? I've also considered this to be an issue with my CYA levels, or if it's just dead algae and I need to work on getting it out. I've seen to stop adding chlorine, which I have done. But is there any other product to add to clear things up?

So a few questions....
-Best way to get rid of dead algae?
-How to clear up water?
-Steps to identifying the problem when having muggy water.

-Kevin