Quote Originally Posted by chem geek
I get that 1 box (76 oz) of Borax (decahydrate) will raise 1000 gallons by 64.54 ppm which is quite a lot more than the 50 ppm you quoted. I don't think an error of 10% is a huge deal, but this is a bit beyond that (about 15%). This 1 box of Borax also requires 38.56 oz. of acid or 4 cups, 6.56 oz. That's pretty close to 5 cups to be accurate enough.
If my math is correct than 3lbs 12 oz should raise 1000 gallons 50 ppm and would need 4cups (1 qt) acid to ajdust the pH.
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Does this sound right to you?