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I recently cleaned up after brewing one day and realized that I threw away a couple of four gallon water jugs. Could these be used for storing grain for long term? Would the air in the container affect my grain over time? If these can be used for storage I can save the money I wanted to spend on feed containers.

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Most maltsters ship their grains in bags that are not air-tight, but they don't recommend storing them for long periods of time (12 months, max). A plastic jug isn't as air-tight as it seems because it is gas permeable. Even if it was air-tight, it wouldn't matter unless you used nitrogen or CO2 to flush-out all oxygen from the container. Nobody really does that kind of thing with grains.

The main idea for your containers is to keep pests out of your grain (bugs, mice). They should work just fine for that purpose.

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Awesome! Now I can use the feed container money on a couple sacks of base malts! Thanks. –  TMC May 9 '13 at 2:47
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I would recommend using wine must buckets, you can normally find them for a few bucks and some of them are compatible with Gamma Seal Lids.

These will help with storage, but you should aim to go through your supplies within 12 months of manufacture.

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I'm assuming these buckets are much like fermenting buckets with the sealed lids except no stopper hole? –  TMC May 9 '13 at 20:35
    
Yup, they're not good for fermenting since they're thinner walled and easier to scratch. A lot of must now comes in boxes, so you may have to wait a bit before you find any. I have 2 dozen of them in my basement, all labelled and easy to access. –  DougEdey May 9 '13 at 22:16
    
A general Google search gave me nothing on "wine musk buckets" or "mush buckets". I know kind of know what to look for now though. Seeing as how I would need to exhaust all of my grain supplies in a year I might be reconsidering buying that much grain. –  TMC May 10 '13 at 0:49
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