The EFFEN Vodka taste profile was developed with support from leading bartenders who pour spirits every night. Bartenders, the true drink experts, served on our panel to improve upon a centuries-old Dutch recipe that is perfect on the palate. The water used in EFFEN Vodka goes well beyond the standard filtering process. Pure spring water is forced through specifically constructed filters under extremely high pressure. This process ensures that all impurities are removed for the purest water attainable.