Overview Panorama to External, Outdoor Reservoirs For Filtration About the Water Drainage in the City, Outdoor Open Pools With Dirty Water, Clean Water, Waste After Filtration, Purification Rate, Rate Indicators, Processing of Natural Resources, Water Saving, Urban Ecology, Processing and Reuse Water, Urban Water and Sewage System, Water Distribution Through Pipes. Contemporary Technologies Help to Preserve the Ecology, Chemical Pollution of Water, Bacteriogolic Water Pollution, Bacteria in the Water, the State of Water in the City, the Quality of the Water in the Tap, What Water we Drink, Water in Our Lives, How to Get Clean Water.