Brief update: The pool seems to be getting a bit cloudier again. Still blue though. I've been testing and adding chlorine daily to hold at 7-8 FC, and there's no indication that there's any algae activity (loss of no more than 2ppm FC per day, usually closer to 1, 0.5 CC or lower, but it has been unseasonably cool and rainy.) I've been doing the FAS-DPD test once nightly so I can get a baseline of how much chlorine I lose, so my numbers are pretty accurate (if not valid for usual summer temps.) I added stabilizer to 50ppm CYA last weekend and thought that might have contributed to it. PH had also crept up to 7.8 and I dropped it back to 7.2 with MA Tuesday night. There is what seems to be dirt daily on the pool floor, but I've chalked that up to the gusty winds and being in the desert. It's getting sucked up by the Dolphin.
I'm inclined to think the ZeoSand is the problem, and still want to swap to good filter sand. I am planning on a re-plaster at the end of the season. Should I wait until that's done to change the sand? If not, I'd be inclined to change it now.