Galena
Landlord.
Thanks, that was what I was thinking, but needed confirmationIt's just a quirk of the software, the alkalinity displayed as 98ppm is the pre-acidification value and it doesn't display the post-acid alkalinity because when using a calculator that's irrelevant. It shows you the reduction in pH from the acid which is what you are targeting.
Great, that answers it then finallyIn practical terms then, input your base water profile and the grain bill into your calculator. Add enough gypsum and/or calcium chloride to get about 100ppm of calcium. Now what is the predicted mash pH? If it's a little low then add a touch of bicarbonate until the pH is good. If it's a little high add some lactic acid until it's good. It's as simple as that.
You know there are politer ways of putting it.And @Galena proves it by prattling on more about "Alkalinity".