RO purifier is good or bad

I had bought a new purifier Eureka Forbes Classic one year ago.

Before buying classic, I had delima whether to buy UV based purifier or RO (reverse osmosis) based purifier.

Based on various reviews, Boiled water is only safe.

Here are few advantages and disadvantages of various purifiers.

1. RO Purifier Advantages

• Removes salt.
  

• Best purified water.

RO disadvantages

• Not good for children, as it is removes minerals.
• Children may get infected frequently, if they drink other than RO purified waters.

2. UV based Purifier Advantages

• Quick filtering.
• Costs less than RO purifiers.
• Instant filtered water are viruses, bacterias.

UV purifier Disadvantages:

• UV rays will not kill bacterias, it will only disinfect them.
• UV filtered water has to be used within 4-5 hours. After that, the bacterias may regenerate.
  

3. Boiled Water

• It is only the safest method.
• Doctors advices to drink only boiled water.
  
• Only Boiling kills bacterias and viruses.