Borax is alkaline just like baking soda is alkaline, sour is acidic. I used to add borax to my pool to bring the ph up. The pH of borax is 9.3 and baking soda is 8.4. Ammonia is about 12 and lye is 13 to 14 while Clorox is around 12.2. Neutral pure water is 7. The acidity of laundry sour cancels the alkalinity of borax, lye, baking soda, bleach, and other substances in detergents and helps bring the pH back to the neutral 7 level. I know some Clorox splashed on the top of my mother's Maytag and it went unnoticed...it etched the porcelain...but this was pure bleach.