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Old 10-08-2013, 08:35 PM   #1
Madsciontst
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Default Low original gravity

I can't figure out where I am going wrong. My OG was 1.030 when it should have been 1.051. My temps were good in the mash and the volumes were correct. i even added a pound of dme to 5 gallons and the gravity went up minimal, like a few points. Should I mash longer? This is the second beer that had a low OG. Could it be my hydrometer is bad? It comes up at 1.000 on tap water.


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Old 10-08-2013, 08:40 PM   #2
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We're gonna need a little more specifics if your gonna get any good advice. Are you doing AG or Extract? What did your recipe look like? What's your process...i.e. mash temps, how your measuring temps, mash length, efficiency numbers, sparge temps, pre-boil volumes and gravity, post boil volume and gravity. There are a number of things that could lead to low efficiency hence low OG, but these are a few. Let us know and we can try and help.


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Old 10-08-2013, 08:42 PM   #3
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+1 ^^^ also check your thermometer.
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Old 10-08-2013, 08:53 PM   #4
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It was yuris thunderstruck pumpkin ale. The recipe is ag. And it is on beer smith. It's a 5 gallon batch. 6.5 gal boil size at 60 min. Mash temp was 158 for one hour. Mashed in at 170.5 and sparged at 168.
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Old 10-08-2013, 08:59 PM   #5
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Do you know what your pre-boil gravity was? With such a low OG, your pre-boil must have been really off. Is this the first time this happened?
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Old 10-08-2013, 09:06 PM   #6
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I think it was around 1.022 at 150 or so degrees. And no it happened on my last ag batch. This time I added a pound of light dime and it really didn't change it.
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Old 10-08-2013, 09:07 PM   #7
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First place to look is the quality of crush. If the LHBS is crushing, ask them to crush twice
Second, Are you stirring the mash thoroughly at mash in to eliminate dough balls, stirring again at the half way point?
Third, are you stirring like hell before vorleuf and sparge (Batch sparge)?
Fourth, are you meeting your pre-boil volume and is there any wort left in the tun when you finish?
Fifth, What is your mash pH?

All of these things need to be taken into account to raise your efficiency and ensure proper conversion and extraction of all those tasty sugars in the mash.
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Old 10-08-2013, 09:11 PM   #8
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I did everything you suggested so maybe it is the grain crush.there is less than a half gallon left in my mlt.
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Old 10-08-2013, 09:11 PM   #9
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Yeah that's really low dude. Something must be going wrong with your efficiency. For your hydrometer, it's likely not the issue if it reads 1.00000 in water. When I had issues with efficiency, I was getting around 60%. Not too far off your issue. I got my thermometer dialed in on boiling water and crushed a little finer that my LHBS had their crusher set on.

Now I'm working with 80% efficiency. Crush your own grain? Mind explaining your procedures? Maybe a fix can be found somewhere in there.
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Old 10-08-2013, 09:16 PM   #10
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Oh 1 more question. Do you fly or batch sparge? As duboman said, you need to mix like hell when you mash, during the mash a couple times, and before you begin sparging. But, for when you fly sparge, every so often, use your spoon to disturb the top 1 inch of the compacted grain bed. This was something I also did and got my huge jump in efficiency.


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