Reverse Osmosis water can either be good or bad depending upon the system we use. Water treated with reverse osmosis removes all the essential components like iron, magnesium, calcium, and fluoride. Fluoride presence is even more important for the kids to get rid of cavity problems. Thus if your reverse osmosis system removes all these required components from water, it makes water unfit for drinking. Better you choose the system accordingly as minerals always do not define that they are contaminants. They are also beneficial for the body.