KENT Grand Plus

If someone asks for one water purifier recommendation without telling me anything about their water, this is the answer. The Grand Plus is not the prettiest or the cheapest unit in this list, but it is the most consistently correct one: an RO membrane rated to 2,000 ppm input, UV and UF stages behind it, and a TDS controller so that low-TDS supply does not get stripped to tasteless.

The two features that actually justify the price over cheaper RO units are Save Water technology and the service package. Legacy RO designs throw away three litres for every litre they purify. KENT's recovery design roughly halves that, which in a metro paying for tankers is a real line item, not a green talking point. And the three years of free service matters more than any spec sheet — in this category the failure mode is almost never the hardware, it is a technician who never turns up.

Where it loses points: the design is unapologetically appliance-grade, the footprint is large, and there is no hot-water dispensing. If your water tests below 300 ppm, you are buying capability you will never use — look at a UV+UF unit instead and save both money and water.