There is not a calculation for how much Borax to add--re-read my above post about other variables affecting it. Your pH is fine at 7.2. If you're using trichlor or dichlor to shock, then stop using it, because that's what is driving your pH down. If you're using something else, just aerate your water and your pH will rise. Unless your pH is falling, and you're NOT using trichlor or dichlor and have to explanation for the drop, I wouldn't worry about the Borax for now.Originally Posted by BW-poolmom
Janet
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