Tunisia has indeed finite water resources. Her water potential is approximately equal to 5 billions m 3 per annum. The resources that can be mobilized per capita annually account for 465 m 3 and this is deemed by far lower than the poverty line set out by the United Nations…

Very small air bubbles may appear into water as the pressure drops or temperature rises because solubility in the air has decreased. The play of light is responsible for this typical milk-like appearance. This phenomenon has no impact on water in-built quality.