ZeroWater's 5-stage filtration technology removes 99.6% of TDS and does not discriminate between bad chemicals and good minerals that could be present in the water; the filter removes all of these. Many nutritionists recommend that you receive essential vitamins and minerals from a well-balanced diet, and not necessarily from water alone. Additionally “The consumption of low TDS water, naturally occurring or received from a treatment process, does not result in harmful effects to the human body.” We encourage users to read the following article which articulates this question in further detail.