SDepue3 Posted July 7, 2021 Report Share Posted July 7, 2021 On 5/12/2013 at 9:26 PM, chem geek said: Yes, that's the stuff. Concentration is everything. Boric acid kills insects not only because of the higher concentration you use, but because they have no way to excrete boron from their bodies -- unlike mammals who can excrete boron (within limits). Also, the boric acid does not get absorbed through your skin and you won't be drinking quarts of spa water. I have hard water and have the "Sandpaper feel" in my Hot Tub, I have bough Harris Boric Acid to remove the hard water deposits. Can I get in the water after adding the Boric Acid to scrub and clean the hard water deposits? After cleaning should I drain the Hot Tub and refill? Thank You, Sandy Quote Link to comment Share on other sites More sharing options...
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