If you’re filtering store bought vodka, it should already be fairly pure anyway (at least in a relative sense; people drink the stuff so it can’t be too harmful as it is) and this is less of a problem than if you’re filtering something … Hypothetically speaking, if something is being removed by the ion exchange resin and replaced by hydrogen (which then forms H20 ) then this would water the solution down – however, the ion exchange only removes metals (which shouldn’t be …

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Still Smart » Filtering Spirits Using Brita Type Filters