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Haha. My Chem major roommate and I used to do this in college while hosting house parties. We'd do 3 rounds of filtration using a Britta purifier with Popov Vodka and fill up a sanitized Ketel One bottle with the result.

Popov, Smirnoff, and Ketel One are all owned by Diaego PLC and due to Federal regulations, all vodka is almost basically the same - excluding filtration of course.

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It is all watered down industrially produced ethanol. Tito's puts theirs through a pot-still but its still the same corn ethanol created by some giant factory in the mid-west. If you want to make your own pot still you can take the bottom shelf vodka, run it through the still then dilute it back to 70% with distilled/RO/DI water and get a Grey Goose bottle from the recycling and keep refilling it. No one will ever be the wiser.

Is there anything to worry about the vodka pulling out of the filter, e.g. chemicals? This sounds like an interesting experiment, my (probably ignorant) concern would be that running the vodka though a filter designed for water may do something bad to it. Is it completely harmless?

My Chem major buddy said it was fine, but I'm not an accurate judge of that as someone who studied CS and PoliSci.

Removing impurities makes it slightly less bad for your body.