Ok...settled on stopping the draining process at about 60% removal...according to the pool calculator this should put my CYA level around 45 after refilling....which is underway. I worked for a while longer raking the bottom with the leaf basket and really pulled a bunch of decomposed leaves and crud out. The water was low enough and clear enough that when the crud settled again you could see where I dragged the basket.

I added 6 jugs of bleach but decided my circulation at this point probably isn't enough to really do it any good. I think I'll just get it all filled and get the pool pump and filter running and start fresh.

The "Best Guess" chart says for +shock+ at my expected CYA level to go for 30ppm. The Calculator says that's 11 jugs!!!!

Does this sound right or should I just go for the "shock" of 15ppm and maintain that until clear?