If there is no drinking water – there is no settlement. If there is settlement, there is waste water. Waste water is a constant companion of settlements. In our country, cities and most of larger settlements have already built sewage systems, but many of them have no water purification plant. Waste water is the cause of serious environment pollution, especially the pollution of surface water as well as underground water. The situation is bad with tendency of worsening. Technical waste water purifiers must be built in all cities and larger settlements. There is no funds at the moment for such a challenging work. Technical water purifiers are needed in cities as well as in small settlements. There are going to be build one day, maybe 2 or 3 decades from now. But, what until then?