Simply put, Yes. The residential Reverse Osmosis system can remove up to 99% of over 1,000 harmful contaminants like chlorine, fluoride, arsenic, asbestos, calcium, sodium, lead (removes up to 98%) and more, but it will also remove some beneficial minerals. However, water is not a main source of our body minerals. You can find how much minerals you will get from water in Bureau of Reclamation (USBR). Most of the minerals intake is always from daily food and diet. However, there are many issues of drinking water that you should concern, such as chlorine, fluoride, arsenic, asbestos, calcium, sodium, lead and more. These contaminants that under sink Reverse Osmosis system removes can have a long-run risk of your health.