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Old 01-12-2014, 03:20 PM   #1
zach1288
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I'm brewing an oatmeal stout soon and have some water profile questions.

I use 100% distilled water for all my brewing.

Here is what I have for the water profile:

Mash PH: 5.5
Ca: 82
Mg: 0
Na: 0
Cl: 98
SO4: 65

My alkalinity is 0. Do I need to add alkalinity? I have never done this before using distilled water. I'm curious if this matters?

Thanks,
Zach



 
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Old 01-12-2014, 03:31 PM   #2
JonM
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I just worked through the water additions for an oatmeal stout I'm making next weekend, and my figures are pretty similar. Are you using software like Bru'n Water?

My recipe required me to add some pickling lime because the dark roasted grains add a lot of acidity, which brought my predicted pH way too low. (Unfortunately, I'm away from my home computer, so I can't access the Bru'n Water profile I put together.) But if you're at 5.5, that's just about right. I'm going with 5.5 too because I saw a recent comment from Martin B. saying that's a good target for stouts.


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Old 01-12-2014, 03:52 PM   #3
zach1288
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If my PH is right do I need to add alkalinity?

 
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Old 01-12-2014, 04:06 PM   #4
grathan
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Quote:
Originally Posted by zach1288 View Post
If my PH is right do I need to add alkalinity?
No, alkalinity is only for ph.





I just made an oatmeal stout with distilled water. I added the dark grains at sparge. Came out good.

 
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Old 01-12-2014, 04:38 PM   #5
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Quote:
Originally Posted by zach1288 View Post
If my PH is right do I need to add alkalinity?
Nope - if you add alkalinity, it will raise the pH beyond the acceptable range. Looks like your predicted numbers are good where they are.

If you check the mash pH during the mash and it's too low, you might need to add alkalinity at that point.
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Old 01-12-2014, 05:11 PM   #6
zach1288
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Do I need to worry about adding Na or Mg?

 
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Old 01-12-2014, 05:13 PM   #7
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Nope. Na and Mg aren't needed.
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Old 01-12-2014, 07:28 PM   #8
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Quote:
Originally Posted by JonM View Post
Nope. Na and Mg aren't needed.
But may be desirable for flavor.
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Old 01-15-2014, 05:32 PM   #9
zach1288
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I just finished mashing in. I realized that I did not add any of the brewing minerals to the mash. My estimated PH was 5.5 without adding anything, so I was planning on adding my minerals in the boil just for flavor. I believe I read somewhere that mashing with 100% distilled you need to add calcium, is this true?

 
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Old 01-15-2014, 08:03 PM   #10
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Quote:
Originally Posted by zach1288 View Post
I just finished mashing in. I realized that I did not add any of the brewing minerals to the mash. My estimated PH was 5.5 without adding anything, so I was planning on adding my minerals in the boil just for flavor. I believe I read somewhere that mashing with 100% distilled you need to add calcium, is this true?
You don't have to, but it is a good idea. Yeast will do just fine without calcium in the water since the malt provides calcium too.


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