So we cheated, and had the kids in the pool with us when we were cleaning up the lights and some other areas that were visible once we were in the water.
Tested the water at 4:00 pm, FC was 7, which is still well below our target shock level of 12. We definitely got gunk out of the niches and from around the lights. cleaned in the skimmers, the edge just under the decking, the wall (had a slime line near the water edge. Also decided that growing algae and mosquito larve in the spa was not favorable, so we got in there, scrubbed out the returns and drains, and then filled it. We're letting it do the spill over thing, just running the main filter pump.
When we got out at 6:15, FC was 5.5. Sunny, 5 bodies in the water, 85+ air temp. I guess I'm thinking that's not too awful of a loss. But, since we've cleaned what we can, We've put the kids on notice that we won't be back in the water until we are done with our SLAM, and that could be several more days since we decided to play today.
All in all, I can say that I think I'm going to like pool life....
After we get cleaned up and do the supper thing, I'll recheck my levels in about an hour, and continue on our path to crystal clear sparkles!