The fresh water is pumped, removed from largest waste then filtered. A little coagulant to agglomerate the particles, to wait one day that they fall at the bottom. Then water is still filtered in sand. A little chlorine and the drinking water is stored

A drinking water is a water which can be drunk without danger. Drinking water for all is a current challenge and this challenge will not cease becoming complicated. Aujourd’hui, 40 % of the world population lack of water. In less than one century, the demand for water will be double. Water is a rare food product and the drinking water is even more.

Under their clear and colourless air, water can hide micro-organisms or very dangerous pollutants for health the water intended for consumption must thus be treated in a drinking water factory. The floating matters on its surface are eliminated by means of filters and from the chemicals which agglomerate the particles. Pulled by their weight, they pile up at the bottom of the basin. Water crosses then a bed of sand which retains the last suspended matter.

Comes then the essential stage: disinfection. Water receives initially a good amount of gas, ozone, in order to remove bacteria, virus and organic matter. And a petite' drop of chlorine, one... for the equivalent of 5 bath-tubs of 200 liters! It is largely sufficient to neutralize the germs. Before supplying our taps, water will undergo 63 more Draconian tests of quality in order to check that with the length of its way, it remained drinkable. The presence of more than 1 microgram of mercury per liter of water, can lead the health services to declare it unsuitable with consumption!

Salted water can it also become drinkable thanks to the desalination plants. But this technique develops little because of its high prime cost.