New answers tagged corny-keg
I don't think you would have to change anything. As 30 PSI is the same in a any sized container.
It depends on the surface area exposed (and whether you are shaking the keg). For the short corny's I've seen, the diameter is the same as a 20L, so the you have the same surface area for half as much beer when the keg is standing. So half the time should work if you're not shaking it. To carbonate in 10 minutes I suspect you're holding the keg sideways ...
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