The Muriatic Acid i have is 31.45%,, on the app would i select the 29% or the 31.45 % (20° Be) ?,,
This is what i have > https://www.lowes.com/pd/Kem-Tek-2-Gallon-Muriatic-Acid/4570022
This is what i have > https://www.lowes.com/pd/Kem-Tek-2-Gallon-Muriatic-Acid/4570022