It is all to do with the size of the oak pieces.
Oak chips (such as wot Karl sells) have a high surface area relative to their size, so require a short contact time (days or a couple of weeks). Cubes require longer, spirals longer still, and barrels longest.
Oak chips (such as wot Karl sells) have a high surface area relative to their size, so require a short contact time (days or a couple of weeks). Cubes require longer, spirals longer still, and barrels longest.
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