Humans may live for a month or more without food, but
only a few days without water; only oxygen is more
important. Each day, the body loses up to three quarts
of water. A loss of only 10-20% of the body's water
content could be fatal.
When we take untreated
water from a river or reservoir, the water often
contains natural wastes and pollutants, such as
bacteria, solids (like mud, sand, and debris), inorganic
minerals, and decayed organic compounds, as well as
trace amounts of certain other contaminants. Such water
is not good for human consumption.
transfer this water to a treatment plant where water
will be filtered and chemically treated to be ready for