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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Very Low Original Gravity After Mash, Need Quick Advice!
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Old 05-16-2010, 07:21 PM   #1
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Default Very Low Original Gravity After Mash, Need Quick Advice!

I did my first all grain brew this morning. It was a small batch of a very big beer, about 8.5 lbs of grains in a 5 gallon pot. i'm only making a 2.5 gallon batch.

when i finished mashing (131 degrees for 30 min, 149 for 50 minutes), the specific gravity was only 1.020. i'm shooting for 1.080, so something has gone terribly wrong!

i'm putting it back in the mash for another hour to see what happens. I could use any advise ASAP! My guess is that the grains were not crushed or something. I inspected them and they looked cracked, but they looked like any other grains i've used in partial mashes.

Any advice, especially quick advice , would be much appreciated!

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Old 05-16-2010, 07:24 PM   #2
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You need to cool the wort down to take the specific gravity. Anything over 90-100 and it will read so far off you can't do a temperature correction. Just take enough out to fill the testing cylinder and begin boiling the rest. After a few minutes check the temps on the test wort and then take a hydro reading.

With that much mash in that small size pot you should try and boil the 2nd running's into a 2nd beer if you have the fermenter space.

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Old 05-16-2010, 07:33 PM   #3
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You also need to stir very well to mix up the wort, otherwise you will be taking the gravity of the final runnings (which will be low).

-a.

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Old 05-16-2010, 07:46 PM   #4
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i'm cooling down the sample, it was very hot. hopefully that's the problem--easy fix

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Old 05-16-2010, 08:01 PM   #5
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after cooling down to 59 degrees, the hydro read at .1050, which is ALOT better than 1.020. still, i was trying to get to 1.080, so i'm not exactly sure what went wrong.

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Old 05-16-2010, 08:05 PM   #6
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Try taking one post boil.

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Old 05-16-2010, 08:15 PM   #7
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grain bill?

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Old 05-16-2010, 08:21 PM   #8
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your gravity will be higher prior to boil. multiply your preboil volume by your the last two digits of your gravity reading then divide by your post boil volume target to find out where you will be for OG

Ex: 3.5 X 50 = 175
175/2.5= 70 = 1.070. add 4 oz DME at 15 minutes left in the boil

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Old 05-16-2010, 08:27 PM   #9
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Quote:
Originally Posted by chefchris View Post
grain bill?
7 lbs two row
1 lbs crystal 60L
.5 lbs debittered black
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Old 05-16-2010, 08:29 PM   #10
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You can also boil some extract and add it, to increase your gravity.

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