UV water purifiers can only kill the disease-causing germs and bacteria. They fail to remove the bodies of these micro-organisms and other dissolved solids. On the other hand, RO water purifiers can remove all the contaminants and also eliminate the dead bodies of these micro-organisms.
Moreover, RO water purifiers can enhance the taste of water, and the mineral cartridge retains the essential minerals. They are perfect for areas with high TDS. Thus, even though RO is more expensive then other filters, it is a better option.