Our taps provide us with water but the quality of this water differs and is usually much worse than we need for healthy lifestyle. Some contaminants and bacteria found in drinking water may cause serious illness and it's better to use water filters to remove them and reduce the level of viruses and contaminants.
Fluoride is often added to municipal water systems as it's effective in reducing dental cavities at an optimum level of 1mg/l. But the monitoring shows that the level of fluoride in water may exceed 2mg/l and more and allowable level is now 4mg/l. There can be various health and personal reasons for removing fluoride from the water we use for drinking, bathing, cooking, etc. If you want to remove fluoride from your drinking water, use reverse osmosis system that is highly effective in reducing the fluoride in water.