pool is 24,000 gal in ground gunnite pool.
on 5/23, shortly after opening, I tested FCL, TCL, PH, Alk & CH using chemical test kit. Alk was 68 AND CH WAS 77. I added about 5.5lbs of baking soda, which was all I had on hand, to bring Alk up and ordered more along with calcium hardness...