Quote Originally Posted by Simmons99
Well I used 4 lbs of Borax on a 14,000 gallon pool with the TA at 120 - I will test again tonight - but preliminary tests raised it from below 6.8 to ~7.0.
My calculations show that this would raise the pH from 6.8 to 6.95 which is in the ballpark of what you found.

If you wanted to continue to raise it to 7.4, you would need to add 133 ounces (8 pounds, 5 ounces) more. Also, doing this increases your alkalinity so your TA would then be 147.7 and you'd probably want to lower that, THEREFORE I suggest that you follow Ben's Lowering Your Alkalinity procedure first while you still are at lower pH so you can get your TA down a bit more AND so you can raise your pH while keeping your TA constant (by doing aeration instead of adding Borax). In other words, I don't think you should be adding any Borax at all and instead should just do the aeration at low pH (continuing to add acid until you get to your target TA) and then continue to aerate (stopping the addition of acid) to make the pH rise without affecting your TA.

Richard