India, Oct. 5 -- Think about everything we expect a geyser to do.

Heat water. Do it quickly. Do it safely. Keep working for years.

And when we talk about geyser innovation, that's usually where the conversation stays: better tanks, better heating elements, corrosion protection, pressure control and energy efficiency.

All of this matters.

But there is one obvious part of the experience that doesn't get the same attention: the water itself.

Your geyser may be doing its job perfectly and heating the water, but the water coming into your home may still be hard water.

If you live in a hard-water area, you probably know the signs. White deposits around taps. A showerhead that needs cleaning too often. Bathroom surfaces that never seem to ...