Had my inground pool replastered Sept. 3, 2012. Contractor suggested a PH of 7.4 and TA of 80.

My PH is 8.0 and TA is 60. If I add acid to bring PH down, TA may come down. If I add Borax to bring TA up, PH may go up.

What is best way to get PH back down around 7.4 and TA back up to 80?

I filled out profile 2 months ago... but here are my specs:
Inground pool
17,000 gallons
CH 2.4
PH 8.0
TA 60
Hardness 250

No heater. Southern CA. Not swimming now through next spring.

Thanks for any help and advice.
Bob