The mass-scale destruction of natural system had impaired the species diversity that is the required condition of biosphere stability. The obtaining today system is founded not on the balance, but on the maximum exploitation of water, soil, bioresources and energy. But if every of us makes for the environment only one kind proceeding, contribute your own efforts as collaborations of Kishinev Station of Wastewater Treatment make – the weakest urban river can turn into clean joyful stream.