In case you're still interested I should perhaps mention that distillation "wears" the copper. The copper itself actually helps "clean" the spirit of volatile chemicals but while doing this the copper is also "sacrificed" . When it's 50% of its original thickness most distillers will replace the part in question - or the whole still if necessary. Hope this answers your question.
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"Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut."
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