Adjusting pH level in mash with Brewfather

Adjusting pH level in mash, when brewing beer by the use of Brewfather.

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[indiekiduk]

The problem is the calculated pH assumes you are starting with distilled water. Even if you enter your source water pH in Profiles->Water and choose that source in the Recipe, it has no effect on the calculated pH. This seems like a major flaw to me because you are probably adding the wrong amount of acid!