Water is the most important resource of mankind. The lives of all organisms depend on the presence of water. The amount of fresh water in the world is around 2.5% - 3% of the total amount of water. In this part, 75% of the glaciers in the polar regions are outside the human habitat. However, the remaining 1% is suitable for human use.

Pure water is rarely found in nature. In general, waters contain various components. Most of them affect the image and taste of water, although not harmful to human health.

Waters in nature generally include the following components

Inorganic chemicals (metals, metallic salts, dissolved gases ...)

Suspended solids (alluvial and inanimate organic substances, animal and plant microorganisms)


We can examine the microbiological diseases in 4 categories

  1. Protozoal Infections
  2. Parasitic Infections
  3. Bacterial Infections
  4. Viral Infections

2/3 of our body is water.

Every person needs about 2 liters of water per day.