The Bioelectrical Body Composition Analyzer is a medically approved device which is registered with the FDA. It is considered one of the most accurate ways of measuring hydration and cell water turnover. When individuals drink 8 oz. of filtered or spring water, the device will show water movement at the cellular level in 45-60 minutes (this is considered normal). But, when individuals drink 8 ounces of Vitalized water, water movement is shown in as little as 10 minutes!