5 Boxes of Borax later.... PH STILL very low

[chem geek]

doggie,

If you believe that your TA used to be lower and that it has gone up, then as Carl says that wouldn't have come from the Borax. Most likely, it came from your fill water. Is your fill water from a well? Have you tested it for TA and CH? That's my best guess of what may be happening. In any event, Marie is absolutely right that now is a great time to lower the TA since you've already got a slowly dissolving acid in your pool and that's perfect for lowering TA through lots of aeration.

Richard

[CarlD]

doggie,

If you believe that your TA used to be lower and that it has gone up, then as Carl says that wouldn't have come from the Borax. Most likely, it came from your fill water. Is your fill water from a well? Have you tested it for TA and CH? That's my best guess of what may be happening. In any event, Marie is absolutely right that now is a great time to lower the TA since you've already got a slowly dissolving acid in your pool and that's perfect for lowering TA through lots of aeration.

Richard

Richard's right. My fill water, which is public water, frequently runs a T/A of 180ppm--safe to drink, of course. You should check it.