Most ultra-premium vodkas are filtered three to five times. Crater Lake Vodka is slowly filtered 10 times through charcoal and crushed volcanic rock and then aged slightly in oak. This technique is long and painstaking but makes Crater Lake Vodka one of the smoothest vodkas in the world with it a soft, spring water feel that hints slightly of vanilla. Crater Lake Vodka is an excellent selection for any cocktail that calls for ultra-premium vodka. Real vodka connoisseurs though will most appreciate Crater Lake in a classic dry vodka martini