In the absence of clean drinking water, most people haphazardly install RO purifiers. The problem with RO systems is that it also removes the good minerals along with the bad. Also, around 70% of the water is wasted when there is already an acute shortage of drinking water. As per scientists, RO is not required if the water is not too salty or if the Total Dissolved Solids (TDS) in the tap water are less than 500 mg/litre. Therefore, it is important to understand the quality of water available in your area, before choosing a water purification system.
Source: Vigyanprasar