Hi,
So I opened my pool a couple weeks ago and circulated the water for 4 or 5 hours and tested, and here is what I had.

FC - 0 (I had not added any since closing in fall)
TC - 0
pH - 7.0
TA - 70
CYA - 20

I shocked to 12 PPM (following guidance of best guess chart) and held it their for several days to clear the water as it was cloudy and a little green. The water is crystal clear now and no signs of algae.

Also during this period, I wanted to get my TA up, so I used the Pool Calculator. For 24K gallons of water it said to add 11 lbs (I added 10 lbs) of Baking Soda for a TA of 100. So I added 10 lbs all at once. The next day I tested, my TA had gone from 70 to 140! The pH was now about 7.2.

Now over the course of about the last 10 days, my TA has settled around 110 from the original TA of 140 12 hours after adding the baking soda which is fine. However my pH has crept up to 8.0 from 7.0!

So I'm a little confused as to why my TA went too high initially and why is my pH going so high at 8.0 and what should I do about it?

My pool tested yesterday afternoon as;
FC - 5.0
TC- 5.0
pH - 8.0
TA - 110
The water still looks perfect.

I have 24K gallon vinyl liner
sta-rite heater and sand filter.

Thanks
Andy