After a complete pool refill, and aswitch to BBB with 50 ppm borates (20 Mule Team Borax), I find that I need to add acid every day in order to keep the pH below 7.8.
Here are this morning's numbers:
The pool has a spillover spa, which contributes to the pH rise, but I did not have this issue before. I am adding at least a pint of acid a day in order to bring the pH down to 7.6. I expected increased acid use with BBB, but given my reasonably low TA and 50ppm of borates, I didn't expect to be adding nearly this much.
I should add that the water looks great, and was shocked pretty hard after the refill, so I doubt that I have a bunch of bacteria lurking around. FC consumption is about 1 to 1.5 ppm per day. Combined chlorine has never tested positive.
Should I expect to be adding this much acid? If this trend continues, I'll be spending much more on chemicals than I did with trichlor.