Very Dirty Viscous Water With Light White Foam Flows From One Tank to Another, on the Walls of the Reservoir With Water a Dense Deposit of Sediment, a Stage of Water Purification For Its Repeated Use, a Big Pool With Muddy Water, Water Enter the Tank, Settle and is Filter a Stream of Mud, Foam From the Formation of Gas, the Process of Decomposition of Bacteria, Fermentation in Water, Modern Methods of Cleaning. Filtration of Water in the City For Reuse, the Main Urban Wastewater Treatment Plant, the City's Water Supply and Sewerage System, Storm Sewage, Meltwater, Rainwater, Pipeline Accident, Water Filtration