Natural Water

The liquid water which is formed by the condensation at high altitude is relatively pure and, before reaching the ground, it dissolves gases and absorbs soluble and insoluble compounds present in the air. This water is generally saturated with oxygen, contains the carbon dioxide and can be contaminated by gases issued from industry: nitrogen oxide, hydrogen sulphide, sulphurous gas. It can also contain organic matters and minerals coming from the ground in the form of dust.

When it reaches the ground, many components of the Earth’s crust can be dissolved in rain water during the trickling or infiltration into the permeable geological layers, and this is connnected with the content of the gas dissolved, which helps the dissolving of the minerals, in particular, the carbon dioxide.