Mixing water sources

[cushyno]

Tonight I checked water reports for home and where I work. Both are supplied by UU but water is from different ground sources. Also did an alkalinity test using one of the Salifert kits.

Home - hard:
Calcium = ~66ppm
Magnesium = 23ppm
Alkalinity = 188 (ok for dark beers)

Work - soft:
Calcium = ~32ppm
Magnesium = 4.7ppm
Alkalinity = 21 (ok for pale beers)

If I blend the two 25% home and 75% work, I guess that gives:
Calcium = 40.5ppm
Magnesium = 9.3ppm
Alkalinity = 62.75

Which puts me in the right ballpark for pale-amber ales (with a small addition of calcium).

Can anyone confirm my thinking?

 

[cushyno]

So, I thought this through today. I didn't have any spare bottles to transport water from work (yet). So, bought 3x 5l bottles of ashbeck (oh, the pain of having to buy water, woe is me!). 10l is going on my next brew, 5l will be used for Star San.

Any advice from anyone who has mixed water sources before would be most welcome aunsure....

 

[dan125]

I blend my very high alkalinity tap water with Ashbeck for every brew, and I think your thinking is correct.
You could always add a little acid if you want to brew pale beers.
It'd be helpful to know the choride and sulphate levels so you can determine the best salt additions to make for the type of beer you are brewing, when bringing the calcium up.

I use Beersmith3 software and by setting up the two profiles you could tinker with the proportions, and salt additions to get to the final water profile you want.

 

[cushyno]

...
I use Beersmith3 software and by setting up the two profiles you could tinker with the proportions, and salt additions to get to the final water profile you want.

Didn't know you could do that, thanks for the tip! I might look into BeerSmith.