Water is the most precious nectar of nature: the lifeblood of every living creature on earth. The problem, however, is that although it circles three fourths of the planet, most of it is unusable.

A related concern is that :

Although the population os leapfrogging by the day, total water resources remain exactly the same. This is the reason why we treat water seriously and strive to make every drop count - by rendering it pure and fot for myriad uses.