You say the pool went from green to black -- are you talking about algae?
**Went from green to black—Yes algae.

You say the pool is stained -- do you mean that there's stuff on the liner, or that you've cleaned off areas of the liner, and that after you do, there's still a non-slippery stain on those areas?
**The walls are clean after I brush but it is heavy brushing. Once brushed, plumes of blackish green junk dilute the water to the point you cant see anything.

Does your filter and circulating system work? Are you filtering 24/7 now? If not, why not?
**Yes, we leave it run all summer day/night. However, we found (after we gave up last fall) that the finger-cloth material had some heavy rips. We replaced them over the winter. I havent fired it up yet this year because as of right now, the water isnt black or that smelly yet. We have large clumps of green algae floating on the bottom. You can see them in the shallow end of the pool but cant see anything in the deep. I put a glass jar in the deep end and the water in the jar is almost crystal clear. (no greenish tint) but looking into the deep end, you cant see anything. I didn’t turn the pump on yet because I’m scared of stirring everything back up when it appears I may be at a manageable point for someone to talk me through.

What all was added to your pool by those three specialists? (At this point, you not only have to deal with whatever *was* wrong with your pool, but also with whatever they added.)
**300 lbs of shock, A bottle of something the said mustard algae something, and then a bottle of something that he said requires a liscense to have that will cause the algae to clump together and settle to the bottom of the pool.

--I will reply more in a bit, I gotta run.