I have a 16x32 inground vinyl liner my latest readings:

24,000 gallons

FC: 5
Total Chlorine: 3
Ph: 6.8
TA: 120
Hardness: 100

Over the past 2 days i have added 10lbs of PH Up (5 lbs Borax and 5 lbs of PH from pool store) but my PH has not moved. the water clear