Water is much clearer this morning - I can see the pattern on the shallow end bottom and can see the dark head of the leaf scoop when it is at the bottom of the deep end.
TC was slightly lighter than the 5 level (5 OT = 25 ppm) using the OT kit and the shotglass method so I added 1 gal of 12.5% bleach. As I swept the bottom and walls, plumes of dead algae rose up ahead of the brush in most areas - but the layer was thin enough so that the "just brushed" swath was not distinguishable from the "not yet brushed" area. In days past, the sweeping would leave a obviously cleaner swath as I brushed.

I'm trickling more water into the pool so I can backwash this evening or tomorrow. Haven't been able to test pH or TA due to the high chlorine level. I'll be back at noon to test again. Sky is overcast and drizzling.