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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Max mash for 5 gallon mash tun?
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Old 01-04-2013, 04:10 PM   #1
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Default Max mash for 5 gallon mash tun?

I have a 5 gallon circular igloo style mash tun.
What is the maximum amount of grains you can safely mash with? 10-12 lbs?

Assume normal amount of mash water, say 1.25-1.5 qrts/lbs.


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Old 01-04-2013, 04:16 PM   #2
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Yes 10-12 at the usual 1.25 quarts. I've done up to 14 pounds with using a lower water to grist ratio. Green Bay Rackers Mash Calculator.

Scroll down to the "can I mash it" calculator. It's a valuable tool to use to figure out how much grain can be hel in any sized mash tun.

I've been using my 5 gallon for 6-7 years and have never had a problem with 99% of my batches. The others, the rare barleywine I either borrow someone's larger cooler, or do a 2.5 gallon batch.


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Old 01-04-2013, 04:22 PM   #3
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Bookmarked that page, thanks!
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Old 01-04-2013, 04:57 PM   #4
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Here's an older thread on the subject with a simple chart for reference.

http://www.homebrewtalk.com/f11/how-...-needs-123585/
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Old 01-04-2013, 08:39 PM   #5
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13 lbs max
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Old 01-07-2013, 08:19 PM   #6
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I've done 15 lbs in my 5 gallon rubbermaid water cooler. It seems like the holding capacity is closer to 5.25-5.4 gallons though. I mashed with a 1:1 ratio and topped up with correct temp water once I reached my mash temp to get a little thinner mash ratio. It worked out fine; I just had to be careful when stirring.
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Old 02-10-2013, 06:16 PM   #7
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How fast should a mash tun drain? I have a rectangle 10 gallon cooler. I put 5 gallons in and it takes about 45 min. Is that too slow
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Old 02-10-2013, 06:22 PM   #8
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Quote:
Originally Posted by 317BREW View Post
How fast should a mash tun drain? I have a rectangle 10 gallon cooler. I put 5 gallons in and it takes about 45 min. Is that too slow
Depends on your sparging process. Fly sparging takes a lot longer than batch sparging. With a batch sparge after you vorlaff you can open it up wide open and empty it in a few minutes. Fly sparging can take 45 to a hour.
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Old 02-10-2013, 07:24 PM   #9
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I was planning on batch sparging. I changed my valve no it drains 5 gal in 10 mins. Is that a good flow rate
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Old 02-10-2013, 07:41 PM   #10
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Quote:
Originally Posted by 317BREW View Post
I was planning on batch sparging. I changed my valve no it drains 5 gal in 10 mins. Is that a good flow rate
That sounds more typical for batch sparging. 45 minutes seems too long for batch sparging, typically.


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