Guess I should edit that to "is rarely directly used in pools. . . "
My understanding is that if you add equivalent -- with respect to boron content --amounts of borax and boric acid to your pool, and then adjust to the same pH, you will end up with virtually identical borate ions in the water.
And, I probably have mentioned the possibility of using boric acid. ChemGeek might well have done so, too.
I just didn't recall anyone reporting having done so. But then, I haven't read every thread here, and I don't even remember all of those I have read.
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