Ключевые слова: cement, combined sewer, danger, dirty, domestic wastewater, drain, drain pipe, drainage, duct, environment, environmental, flow, flowing, fragrance, gutter, heal, industrial, industry, municipal wastewater, outdoor, outlet, pipe, plumbing, pollutant, polluter, pollution, river, sewage, sewage pipe, sewer, sewer pipe, sewerage, sewers, smell, storm water, stream, tainted, toxic, treatment, tube, tubing, ulcerated, untethered, waste, waste water, wastewater, wastewater treatment, water, water pollution, waterway,