Quote Originally Posted by tcjones
What is the calculation for Borax and raising pH in pounds of Borax per10,000 gal per pH 0.1 units?
The answer depends on your starting pH and TA level, just as it would with adding any other acid or base. However, at a pH of 7.5 and a TA of 100 the answer is about 8 ounces (weight) so 1/2 pound of Borax (sodium tetraborate decahydrate) to raise 10,000 gallons of water by 0.1 pH.

That same half-pound of Borax would only raise a pH of 7.0 up by 0.04 while it would raise a pH of 8.0 up by 0.14.

Similarly, at a pH of 7.5, that same half-pound of Borax would raise the pH by 0.12 when the TA was 80 while it would raise the pH by 0.08 if the TA were 120.

Do you have a specific current pH and TA level from which you are starting and that prompted your question? Knowing the CYA level is also helpful (though it's impact is smaller).

Richard