In science, medical, research or industrial food processing often requires a certain source of clean water. However, natural water contains many contaminants, bacteria as well as other soluble minerals that are harmful to health. This also causes the natural water does not meet the requirements in the areas mentioned above.

To remove impurities and obtain purer water, bring to boil and it inspired condensation in cold environments. This process is called distillation. Pure water distilled water obtained is called 1 times. Bring 1 times distilled water going again distilling adding 1 will get 2 times distilled water, pure and fewer impurities.