While others have tried to imitate Russian vodka production techniques, they have never totally succeeded. There are three key elements that separate Stoli from its imitators. First, Stoli is distilled from winter wheat, which is the best tasting wheat, not from corn or other grains. Produced in Russia's oldest distillery, its is considered the classic Russian vodka. Second, virtually all domestic vodka producers use processed water to reduce the product to its proper proof, while the makers of Stoli use the purest, softest glacial waters. Last Stoli is carefully filtered through both quartz and activated charcoal, then through quartz again.