I had just shocked up to 20 ppm (using the BBG Chart), and it did hold for a day steady. By the end of the second day, it was dropping very slowly. By the third morning, it was about 10 ppm. That evening, it dropped down to 3 ppm. I raised it 6 ppm last night to about 9, and it was at 8 this morning. Will see what happens tonight. I did have a lot of bugs in the pool and had to vacuum this morning. When I don't run the skimmer, there are a lot more bugs and other stuff in the water. I have had the skimmer shut off so I could use the hose to "aerate" to lower TA.

Here are the numbers from about noon or so today.

Temp: 84 degrees
TC - 8
FC - 8
CC - 0
CYA - 70
TA - 250 (down from 270 three days ago; took 3 days of aeration to raise the pH enough to add more acid).
TH - 250 (May be wrong reading, though)

Water still looks good, though.