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PH and Alkalinity

 
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mvakoc




Joined: 19 Sep 2011
Posts: 152
Location: Evergreen, CO


PostLink    Posted: Tue May 22, 2012 3:25 pm    Post subject: PH and Alkalinity Reply with quote


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Note: moved to it's own topic from the electric pale ale recipe


kal wrote:
My starting pH is even higher. It's sometimes as high as 9. Starting pH is irrelevant. It's the buffering capacity (alkalinity) of the water that is important. If your water is really soft like the previous poster (datlan) then the pH will drop like a rock as soon as you start to add things.

Again, ignore the STARTING pH of the water. It's (somewhat) irrelevant if you are going to adjust it.

So you need a pH meter to check after you make adjustments. This is the one I recommend: http://www.theelectricbrewery.com/parts-list-using?page=5

Kal



Ah, interesting. I am still reading about water modification. So that's where my total alkalinity, CaCO3, of 152 is wreaking havoc, in the sense that I need to add more lactic acid? Thus the benefit of mixing in RO water (which I have access to), in my scenario, is not so much to bring down the starting ph but to reduce the alkalinity to require less acid?

For a typical 10% crystal / 90% 2-row (rough example) brew I find myself adding about 10ml to the mash and 6-10ml or so to the sparge water. I do use the recommended meter to check.
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kal
Forum Administrator



Joined: 12 Dec 2010
Posts: 11120
Location: Ottawa, Canada

Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter


PostLink    Posted: Tue May 22, 2012 3:38 pm    Post subject: Reply with quote

Yes on all accounts.

Usually you need to cutd the water with RO or distilled water simply because you the first thing you want to do iften is get some of the salt numbers down (Ca/Mg/S04/etc) because of the style of beer you're going after. The residual alkalinity (RA) will follow automatically.

Kal

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mvakoc




Joined: 19 Sep 2011
Posts: 152
Location: Evergreen, CO


PostLink    Posted: Tue May 22, 2012 3:49 pm    Post subject: Reply with quote

I've attached my EZ water calculator for my Janet's Brown Ale brew using your recipe.

Since all my mineral levels are under the desired amounts you posted (Mosher's pale ale), I used the salts to bring them to that level. If I cut with 50% RO water but then had to add even more salts to get back to the pale ale profile, wouldn't this have more or less the same effect as using my water originally?

I'm away from a machine capable of running Excel to play with the numbers. Thanks for the insight.



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kal
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Joined: 12 Dec 2010
Posts: 11120
Location: Ottawa, Canada

Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter


PostLink    Posted: Tue May 22, 2012 4:00 pm    Post subject: Reply with quote

Are you sure you're Bicarbonate (HCO3 ppm) level is that high? Seems odd to have it that high when the others are so low.

Cutting with 50% RO water isn't going to do that much since your salt levels are already really low. The biggest drop is the Ca going from 38 to half of that (19), but not much gysum or calcium chloride is required to raise Ca by 19 points.

mvakoc wrote:
Since all my mineral levels are under the desired amounts you posted (Mosher's pale ale), I used the salts to bring them to that level. If I cut with 50% RO water but then had to add even more salts to get back to the pale ale profile, wouldn't this have more or less the same effect as using my water originally?

Good question. I'm not sure as I haven't had to do that myself so I've never researched it. I only understand enough about water to brew the beers I've brewed with my existing water. Wink

Kal

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mvakoc




Joined: 19 Sep 2011
Posts: 152
Location: Evergreen, CO


PostLink    Posted: Tue May 22, 2012 4:08 pm    Post subject: Reply with quote

kal wrote:
Are you sure you're Bicarbonate (HCO3 ppm) level is that high? Seems odd to have it that high when the others are so low.


Yup, rocky mountain well water!



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