pH too low.

Mashing, fly sparging, batch sparging, dry hopping, late additions. Have an idea you want to bounce or stop by and share your experiences here.

pH too low.

Postby indianajns on Sun Dec 13, 2015 9:54 pm

I've been noticing the last 2 beers I have brewed have had a low pH for the mash, in the 4.9 range. Today I brewed a Doppelbock and I shot for a 5.3 pH in EZ water. Again, my pH was low at 4.9. I added Baking soda and this corrected me up to around 5.1-5.2. However, it was probably 20 mins into the mash before the adjustment was made and my efficiency suffered. Was wondering if anyone has any thoughts as to why my mash pH would all of a sudden drop significantly? I use RO water from an under sink unit. I change all of the filters yearly and have not had this issue previously. I have gone ahead and ordered the Ward labs testing kit to test my RO water for piece of mind but I'm not sold that it is my RO unit causing this issue.

My doppelbock recipe had 12.2 gallons of mash water and 7 gallons of sparge water.

29 lbs of munich base
8 lbs of pilsner
2 pounds of carmunich

I added 6 grams of gypsum and 8 grams of calcium chloride to the mash water and also had 3 ounces of acidulated malt. Estimated mash is 5.41. It was reading 4.9 at mash temps during the first 15 minutes of the mash before I added baking soda. I tested the pH with both the colorpHast strips AND with a pH meter I trust.
Thoughts? Thanks in Advance.
User avatar
indianajns
 
Posts: 101
Joined: Thu Jan 21, 2010 4:54 pm
Location: Yorba Linda

Re: pH too low.

Postby DrDually on Mon Dec 14, 2015 8:14 am

What was time period between adjusting pH and retesting?
The pH may have adjusted but you checked too soon after adjusting
I have found that stabilizing may take up to 15 min
Chris aka Dr Dually
drdually@att.net

Life is tough. It is even tougher when you are stupid. John Wayne

Bottled and enjoying: Nada, zip
Kegged: English Brown, American Amber, Double Barrel Ale
Next up: Kolsch
User avatar
DrDually
 
Posts: 447
Joined: Thu Dec 31, 2009 3:23 pm
Location: Santa Ana, CA

Re: pH too low.

Postby dhempy on Mon Dec 14, 2015 9:56 am

How did you take your pH reading? If using a meter .. did you calibrate it before the session?

Edit: D'oh ... guess I missed your last line.

Dan
Last edited by dhempy on Tue Dec 15, 2015 9:34 am, edited 1 time in total.
dhempy
 
Posts: 2357
Joined: Mon May 09, 2005 4:10 pm
Location: Santa Rosa Valley, CA

Re: pH too low.

Postby indianajns on Mon Dec 14, 2015 10:54 am

Thanks for the responses guys.

What was time period between adjusting pH and retesting?


I tested multiple times. After 20-25 minutes it had adjusted up to 5.1. Doesn't most of the conversion take place in the first 15 minutes. If I am able to get it to adjust up does it make a noticeable improvement as most conversion was done before my mash pH adjusted up to 5.1?

How did you take your pH reading? If using a meter .. did you calibrate it before the session?


I used a meter and colorpHast strips. Both x-validated the other. I calibrated the meter that morning.
User avatar
indianajns
 
Posts: 101
Joined: Thu Jan 21, 2010 4:54 pm
Location: Yorba Linda

Re: pH too low.

Postby brahn on Mon Dec 14, 2015 1:50 pm

Did you cool your sample before checking pH?

Edit: nevermind, I see in your first post you said "at mash temp". When you see the recommended pH ranges that is at room temperature. As the temp rises, pH drops, so you're probably in the ballpark pH-wise.
User avatar
brahn
Club IT Director
 
Posts: 1749
Joined: Wed May 31, 2006 5:12 pm
Location: Tustin, CA

Re: pH too low.

Postby DrDually on Tue Dec 15, 2015 4:18 am

brahn wrote:Did you cool your sample before checking pH?

Edit: nevermind, I see in your first post you said "at mash temp". When you see the recommended pH ranges that is at room temperature. As the temp rises, pH drops, so you're probably in the ballpark pH-wise.

+1
Chris aka Dr Dually
drdually@att.net

Life is tough. It is even tougher when you are stupid. John Wayne

Bottled and enjoying: Nada, zip
Kegged: English Brown, American Amber, Double Barrel Ale
Next up: Kolsch
User avatar
DrDually
 
Posts: 447
Joined: Thu Dec 31, 2009 3:23 pm
Location: Santa Ana, CA

Re: pH too low.

Postby indianajns on Thu Dec 17, 2015 10:06 am

How do you guys cool your mash sample used by pH meter down quickly?
User avatar
indianajns
 
Posts: 101
Joined: Thu Jan 21, 2010 4:54 pm
Location: Yorba Linda

Re: pH too low.

Postby jward on Thu Dec 17, 2015 1:03 pm

I was thinking I would make a sample tube out of copper pipe to stir in a cup of iced water but never got that far.
Image
User avatar
jward
 
Posts: 2015
Joined: Mon Feb 21, 2005 10:22 pm
Location: Irvine, CA

Re: pH too low.

Postby SamIam on Thu Dec 17, 2015 7:05 pm

I have some 4oz taster glasses I keep in the fridge. I swirle a couple ounces in one before I take my reading. My meter has ATC so I just try and get the temp down to around 90F. For what's it's worth, I also have used the EZ calc and have noticed that it seems to predict the pH about 0.3 higher than what I usually get.
"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day!"
~Frank Sinatra
User avatar
SamIam
Competition & Style Coordinator
 
Posts: 308
Joined: Tue Jul 19, 2011 10:56 am
Location: Westminster


Return to Techniques



Who is online

Users browsing this forum: No registered users and 1 guest

cron