I'm helping a woman with her pool. She just lost her husband who always cared for the pool. The pool hadn't been opened in two years, and wasn't closed properly. Needless to say, it was a swamp when I got to it. Loads of leaves, brown-black water. I started the system, and shocked the heck out of it. I spent the first few days netting the leaves off the bottom, and keeping the chlorine as high as possible. The pool went from brown-black to pale cloudy blue after about two days. When I wasn't finding large piles of leaves with the net, I started blind vaccing on waste, and adding water. After about a month of constant filtration and vaccing twice a week, I could finally see the bottom in the shallow end. A few days later I could see half-way down the slope. Two weeks have passed, and the clarity hasn't improved since. I opened up the sand filter and checked the sand. I ended up removing it, and putting it back in (I ran into a problem when I cracked the stand pipe). I have been adding DE to the filter to help things along, but I'm not really seeing much improvement. I've used Clarifiers, but they haven't made a difference either.
Is there anything I am missing? Chemicals have been balanced since the first week. Does anyone have any other tricks to try?