Not sure if I have the answer to my question below, but I have successfully accomplished the Aeration / Acid treatment as suggested in the forum taking my TA from 260 to 110 in about 5 days using about a gallon of Muriatic Acid. I did so at pH hovering at 7.5 to 7.7 which is above the suggested. Not that I wouldn't have tried the lower pH but it wouldn't drop once I started the Aeration adding about 20 oz of Acid every 12 hours.

Before I started I was having a problem keeping the pH up and having high TA but now I may have to cut back on Aeration. I do have a question as to why my procedure worked so well with the higher pH? I think it may have to with the higher altitude. Albuquerque is at about 6000 feet where I am against the mountains. Anyone know better about the science of the altitude effect on this procedure?

Unlike another writer to the forum, 2 year old Muriatic Acid worked just fine.

Fiberglass Pool - 7500 gallons - 10 x 25 x 4 ft
FC: 1-3
CC: Not detected
ph: 7.5 - 7.7
CYA: 100
TA: 260 down to 110
CaHardness: 200

I am looking to drop the CYA and raise the Chlorine. Pool level is currently down 3 inches from evaporation for cleaning of the water line. I figure I will need to drain some water before I refill. I have already removed the chlorine tablet floater. I am getting some liquid Chlorine tomorrow to raise the chlorine to a solid 3-4 or may use some Calcium Hydro if the TA drops as I have stopped adding Acid.

Any other tips are appreciated.