I am considering adding borates to my hot tub using Borax. All of the instructions I have found say to use Muriatic Acid with the Borax to balance the PH. Is there any reason I can't use Dry Acid instead? I already have Dry Acid readily available as PH Down. The amounts of Muriatic Acid and Dry Acid to balance the PH rise of the Borax appear similar on the Pool Calculator.