Well, I have drained the pool about 1/3 and refilled it overnight. I recirculated the water for 45 minutes to be sure it was well-mixed with fresh water. Took readings - have no chlorine reading, no CYA reading, Alk is 310 and PH is above 8.2 (top reading on my kit). . . probably about 8.4.

Am goint to start the process now> I have attached a small tube with a 45 degree elbow to one of my jets and turned the other one upward and am getting nice aeration now. Will add 12 oz of muriatic acid to start, then the sequestering agent. I'm not sure I understand the chlorine calc chart. It seems that if my CYA reading is =>0, which it is, since I have no reading, then I need to shock to the lowest level, in other words get my chlorine level to 10ppm. Is this correct? I guess I don't understand what CYA is. It seems that since nothing has been touching the algae so far, that I would probably need to put in a lot more chlorine than I have in the past, but this seems to indicate that I need the lowest level? Am I misunderstanding something here?