There are 3 key elements that separate Stoli' from its immitators. First, Stoli' is distilled from winter wheat, which is the best tasting wheat, not from corn or other grains. Secondly, virtually all domestic vodka producers use processed water to reduce the product to its proper proof, whilst Stoli' uses the purest, softest glacial waters. Last, Stoli' is carefully filtered through both quartz and activated charcoal, then through quartz again.