India, May 15 -- Whenever you go to buy an RO water purifier, the sales pitch sounds like: "More stages, more filters, more purification, more safety."

But here is the uncomfortable truth most brands will never tell you: an RO purifier is not always the healthiest or smartest option for your home.

In many Indian households, especially those receiving treated municipal water, installing a heavy-duty RO system can actually waste water, increase maintenance costs, and strip away essential minerals like calcium and magnesium from your drinking water.

In other words, thousands of people are paying more for purification they may not even need. That is why experts increasingly recommend testing your water source before blindly choosing a puri...