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Five gallon batches generate a certain amount of trub in the fermenter. However, its a relatively small percent of the total batch. I am interested in trying some 2 gallon maybe even one gallon batch sizes for kicks.

I wonder if there is a batch size point at which the trub to beer ratio becomes to big to get a decent amount of beer from. Obviously the trub amount will decrease as the batch size goes down, but is it really linear.

Anyone ever tried a one gallon batch (in an appropriately sized fermenter)?

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Great question, I have been thinking about doing some some one gallon batches just to see what would be best for a recipe, like a porter. I could have a chocolate, a coffee, a chocolate coffee. And I could use the individual gallons to test the amount of chocolate or coffee to add, without brewing five different batches I could just split my five gallons into five one gallon batches. If no one answers this before I try it, I'll let you know how it looks as far as trub is concerned. –  dzachareas Sep 3 '10 at 22:53
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I brewed a one gallon recipe last night and it's sitting in a homemade 6-8 quart plastic primary fermenter. I'll update on trub levels once fermentation is complete. –  Bill Oct 29 '10 at 16:38
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1 Answer

up vote 2 down vote accepted

I do 2 gallon batches on occasion. The brew-in-a-bag method is great for this, but you get a lot of trub. In this 1-gallon jug the dark band under the krausen ring is beer, the rest is suspended stuff. After a few weeks it all settled and I got six bottles of nice looking (and tasting) beer.

Trub

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Only 6 beers out of 2 gallons!!! I'd expect more than that out of 1 gallon. do you filer your work prior to pouring?? –  dsidab81 Feb 23 '12 at 19:55
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