Okay, update.

Checked the ALK this morning, it is down!! About 220, with a drop test. Waterfall still running. pH this morning was about 6.9, after adding 1 quart, (pre-diluted in pool water) of the acid. I will check it again when I get home. May need to add more acid as the pH rises, right?

My free chlorine has skyrocketed! It is at about 3.0ppm right now! I have turned the chlorinator to the lowest setting to try to keep this in check.
Will post more results as I get them. Trying to test twice a day.

Carl.