I think you'll find that it takes less muriatic acid than dry to get the job done, but there's not really an equivalency between the two....just add enough muriatic acid to get your pH down to the 7.0 - 7.2 range. mwsmith has a calculator at this link http://www.hal-pc.org/~mwsmith2/BleachCalc262.exe
that can help you figure out how much to add, based on your current pH.

Janet