India, May 25 -- The water entering most Indian homes today is far less fit for consumption than most people know. A tap that supplied relatively clean municipal water a few years ago may now draw heavy metals from ageing pipelines, mixed tanker supply or increasingly stressed groundwater sources.

This becomes extremely difficult to ignore once the scale of India's water problem is considered. India ranks 120 out of 122 countries on the water quality index, while 21 major cities, including Delhi and Bengaluru, are projected to exhaust groundwater reserves by 2030. At the same time, around 70% of surface water (rivers) remains unfit for consumption.

In conditions like these, a reliable water purifier becomes the only line of defence that...