How much Borax to raise pH?

[chem geek]

Wow, your water is very, very hard. You can try aerating your water (in a bucket or large tub) before adding it to your pool for refill since that will lower the TA. If you do that, you can add acid to it first which will lower the pH to make it easier to lower the TA (i.e. lower the pH and aerate according to Ben's alkalinity lowering procedure). Of course, if you just put in fill water through an automatic floater (similar to a toilet tank), then there's not much you can do except constantly fight the pH rise by adding acid.

The more troublesome quantity is the calcium since that will just keep getting added to your pool more and more. Eventually, you'll have to drain and refill substantial amounts of your pool water to get that down. Sorry you have such a difficult situation.

Richard

[mas985]

TA really has not been the issue since I need to lower PH so much. It pretty much stays 100-120 ppm. CH on the otherhand is a battle. Next winter I will do a refill when the city uses more surface water than well water and see if I cannot start out the season at 200 ppm. It does make me wish I had chosen a fiberglass pool though.

[Simmons99]

Well it worked - this morning PH is 7.5 and TA is 90.