I had a new liner put in a couple of weeks ago and not too long after I got the pool filled I covered it for the season. I have been adjusting the water balance for a little over a week now (I crawl under the solid cover to add chems to skimmer but take water sample in deep end), and have been running my pump 24/7 to make sure the CYA gets dissolved. Here are my numbers:

CYA 45
FC 2
TA 140
pH light orange!
20,000 gal. in ground
New 3/4 hp Hayward Superpump
New multiport
Same old Sta-Rght sand filter

I can't give you my pH because the light orange color doesn't match any color on the color comparator gizmo (OTO). Originally when the pool was filled the color was light pink (same as when I tested my tap water while the liner was being installed), so I thought it wouldn't take much Borax to darken the color up and get it to the 7.2-7.5 range.

I have now added two 4-lb. boxes of Mule Team Borax I bought at the grocery store. But the pH color has gone south -- from light pink to now light orange.

I just took a look at the pool calculator at TFP. For the heck of it I "guessed" and put in a current pH of 6.5 with a goal of 7.5. The calculator told me I need 218 oz. by weight of soda ash. If I take 218 oz. and divided it by 64 oz. which would be what the 4 lb. box of Borax is, I get 3.40. So, then I should add 3.4 boxes of the 4-lb. Borax boxes?

I don't think my grocery store has that many left. I may need to stop at the pool store. I would just buy pH up? But, the real question is, does anyone know what a light orange pH reading would approximate in a number measurement? I don't understand why it went from the original pink after I filled the pool to now light orange. I'm concerned about my pH not being stable. I never had a problem with low pH with my old pool water so this is all new to me. Thanks for any help you can provide.