Here's an update:

Added cal-hypo last night, I premixed in water and added it through the skimmer. I believe I added too much, because now my FC is very high. I diluted 3 parts distilled to 1 part pool water, and it was still pinker than the pink on the color comparator at 3 ppm. So I have at least 12, and most likely higher.

Added muriatic acid today, I believe I added too much, because my PH went from 8.0 to 7.2.

Oh, and BTW, took the sticks out of the chlorinator. I will save them for vacations.

I still have a little mustard algae, but not as much as I did. Pump is running on high 24/7 right now. Is it OK to cut it down to low speed? Should I keep the kids out of the pool? I don't want to fade out the swimsuits. I am going to try to keep the FC level at about 15 for a couple more days, and see what happens with the algae.

Judy