That's gotta be a big pool! Evan gave a really lucid explanation of when to keep TA on the low side and when on the high side--said it better than I could! The Taylor K-1000 OTO/pH test kit uses reagent r-0014 instead of the usual r-0004. r-0014 has a chlorine neutralizer in it so it can accurately read pH at much higher levels of chlorine.

If you need to raise pH AND TA, you can use Washing Soda instead of Baking Soda. Washing Soda is Sodium Carbonate, and is the same as pH Up! and other expensive pool chems, but only costs $.80/lb.

Costco used to sell 12lb bags of A&H baking soda for about $3.50. Yeah, less than 4 bucks for 12 lbs. Don't know what it is now....

Carl