I haven't filled the pool up yet to start the clean-up process so I have no circulation unless I hook up another pump and just circulate it back into the pool? This won't move as much water as fast as the pool pump, but I suppose it would work?

CYA was likely always around 100-110. Pool is in full sunlight.

Draining to about 1/3 left in pool is not a big problem if that is the best thing to do. I can drain down to 1/3 and then refill...get it all running and add 10 gallons of bleach. It will all take me a few days, of course.

Whatever you think is best....I'll do it.