New water supply and Brun Water spreadsheet

mblanks2 said:

My municipal water supply recently changed due to a major malfunction in the water pumping system. I would really like to brew and know the water is different. I'm being told approximately 30 - 45 days for the repairs to be completed. I want to have a new test done when everything is complete but would prefer not to have a test done that I know will change shortly.
The PH is 6.55 where my original supply is 7.9. If I substitute this value ONLY in Brun Water spreadsheet will the outcome be as accurate as before or do the other numbers that are missing play a major role in the final numbers?

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Yooper said:

No, the pH is probably the one thing that doesn't matter a bit. It's the other things in the water that contribute to the actual mash pH as well as the flavor.

I'd probably buy RO water at the store for this batch- they may have started adding more chlorine, or are using a totally different source, and so on.

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