Similar story to ones I've seen on the forums, we just purchased a foreclosed home with a 30,000 gallon in ground pool. The pool has a Hayward sand filter as well as a salt water generator. The pool has set unused, covered for several years and is full of brownish-water and lots of green algae. We purchased a test kit and are showing that the Ph bromine hardness and alkalinity are all at acceptable levels. Obviously, we are showing zero for CYA and chlorine.
We have tested the pump and filter and all are in working order. Our question is are we better off draining it or attempting to clean it? We've already pulled out several massive piles of algae and debris. On the plus side we also found a very nice net in the pool. We have photos, but not sure how to upload those here.