I put about 4.5 lbs of AA in last night (15-20k gallons) and didn't get much of a result at all. In fact, some areas started to become stained dull grey! I did take pictures but I didn't think to bring them to work so I'll try and remember to post when I get back home.
I think I'll be ok draining it. I'm not in a low-lying area, in fact, looking at topo maps, I'm at 803' and the nearest ponds 2,700' away are at 778'. 3,900' to the south is in the low 760' range and that's the usually-dry drainage ditch for the area. The house is also a tri-level so the lower level of the house sits about 4' below ground (and the surface of the pool water) without a sump pump and is always dry. It's only another 4' to the bottom of the deep end...
What are my best options for DIY resurfacing? The pool is mostly concrete with a 3' fiberglass liner around the top. I think the surface was re-painted badly at one point because the staining is very uneven across the surface. It's like chunks of paint came away and then got stained. There are orange-brown spots right next to still fairly white stripes.
I was thinking abrasive blasting followed by some dark blue paint/epoxy.
Edit: Added album of images: http://imgur.com/a/2USPQ