Why not secondary ferment in a primary bucket

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raspberries

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Why doesn't anyone secondary ferment in a primary bucket? It sounds like a nice, cheap alternative to glass or better bottle carboys. As long as it's topped up and the lid is air-tight, isn't it the same thing. The only trade-off I can see is that you wouldn't be able to see how clear the wine is.
 
You certainly could do that, it will be the same as doing a better bottle/carboy. I think the reason a lot of people stray away from the buckets for longer term storage is that the plastic buckets tend to absorb a some of your wine/beer and can retain flavors and odors that you don't want going into your final product. Just make sure to clean the bucket thoroughly. If my bucket smells like stout because I always ferment stouts in it I wouldn't likely put a kolsh or hefeweizen in there. Same thing if you had apple/grape/strawberry flavors or whatever.
 
You certainly could do that, it will be the same as doing a better bottle/carboy. I think the reason a lot of people stray away from the buckets for longer term storage is that the plastic buckets tend to absorb a some of your wine/beer and can retain flavors and odors that you don't want going into your final product. Just make sure to clean the bucket thoroughly. If my bucket smells like stout because I always ferment stouts in it I wouldn't likely put a kolsh or hefeweizen in there. Same thing if you had apple/grape/strawberry flavors or whatever.

No, it's not that. It's simple design.

For example, a carboy topped up to the bung has what? two inches of headspace, or even less, across the width?

A bucket, even topped up, will have 11 inches across, or whatever the diameter of the bucket is. You could use a plastic carboy (I use Better bottles all the time) as the SHAPE is the issue.

In secondary, you want to have almost no headspace. In a carboy, a topped up wine will have much more limited headspace than a bucket. The wine would easily oxidize in a pretty short period of time in a bucket.
 
To add to Yoops post, an opened wine bottle needs to sit for 45 minutes to an hour to properly "oxidize" a good red wine (heck, some take hours), but pour that wine into a decanter with a wide base and it only takes a few minutes.

Surface area = more oxygen touching the wine.
 
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