Thank you all so much for the fabulous, detailed information.

Anna - I did the CYA test again this am. I filled the bottle with water and solution, shook it for 30 secs and set it aside. Then, unfortunately, I was pulled away and the solution sat for 13 minutes. ugh. I did the test anyway - and now CYA reads 30. Think that's reliable after 13 mins?

On the FC/CC front, the Pool Calc you lead me to (thank you so much - that thing is COOL) suggested I add another # of cal hypo last night (so I did) - fell asleep before I could test levels after that application. This am, FC was 19.5 (vs 15.5 prior to cal hypo last night) and CC is 3.5 (vs 4.5 last night). Hopefully, that's a sign toward progress, but I know how these numbers can fluctuate. Thankfully, today is going to be somewhat cloudy, so I'll check again around Noon and then again at dinner, then just before bed.