Thanks RDspaguy! It's moot at this point. After I posted the question, within an hour I had decided to go ahead and break out the new Ahh Some I had and went to town purging and draining. Fortunately, only a small amount of yellowish green appeared on some of the foam bubbles and I got it drained and flushed.
Refilling took less time than I recalled from the first time, only about an hour and a half, and I just booted back up the tub and WOW I forgot what totally clean water looks like. The old water (only one month old, mind you) would turn white with bubbles--they'd clear out after about 15 seconds of jets turning off, so I didn't worry, but this is pure clear. Now on to balancing the water, I have a recent tap water test from my dealer so I'll start with that.
Now I'm off to re-read the notes a few dozen times to try to fully understand the process. I appreciate all your posts over the years, I think I've scanned over most of them over the last few weeks! 🙂