The majority of the swimming pools, ponds and lakes are cleaned and purified by the combination of the plants and the micro-organisms including/understanding the salutary bacteria. These micro-organisms break up the organic losses into substances which the plants can employ directly like food.

The pleasure of using natural water again to bathe and swim, is now at the disposal of many people. This pleasure can meet in the intimacy of a house or publicly in a hotel, a park, or in any center of leisures in mountains or at the edge of the sea.