Hydrologic Cycle

Introduction
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Literally the same amount of water is present on earth today as when the dinosaurs roamed the planet. Water recycles itself on a daily basis. Water falls to the earth in the form of rain. Some of it soaks into the ground where we pump it out for use.

The vast majority of the rain drains into streams, rivers, and lakes when evaporation takes place and the water is returned to the atmosphere. However, we continue to pollute the water by constantly adding substances to the water that this cycling cannot remove.

On the right is a representation of water problems that we are facing today. These problems can be divided into two categories: natural and man-made.

Water problems that are naturally occurring and capable of being removed by softening the water are shown in yellow. Naturally occurring problems that would require specific filtration equipment are shown in blue. Problems that are man made, usually found in smaller concentrations and are a serious cause of concern in our drinking water are shown in red.

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