I have a 20,000 in ground pool. I purchased a Basic Pool Care DPD Test Kit at my local Leslie’s pool store.

The water test reads:
P.H. 6.8
F.C. .5
BR 1

What should I adjust first? After reading a few threads I think I should use Borax first to bring up my PH to 7.4 - 7.6. Am I correct? Please help.