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The baking soda and the acidulated will cancel each other out as far as pH goes.Good question @Donoroto. This is only my second brew using brewing salts, and I just made additions until the calculator indicated that I was in an acceptable range for a balanced profile, using reverse osmosis water.
I have been in the habit of adding 2-4% acid malt to most brews to get the mash pH in an acceptable range according to the recipe editor.
I have only ever needed baking soda with real dark roasty brews when the pH needed to be raised due to the acidic nature of those grains.
I would suggest that you should never need baking soda except to raise mash pH.