Ключевые слова: blackwater, chemical, construction, contamination, dirty, drainage, ecology, ecosystem, environment, environmental, facility, factory, filtration, gray water, groundwater, industrial, industry, liquid, nature, overflow, pipe, plant, pollution, purification, purity, recycled, recycling, reservoir, sanitary, sanitation, sedimentation, separation, sewage, sewage treatment, sewer, sewer pipe, sewerage, sludge, station, storage, system, tank, toxic, treatment, tube, unhygienic, wastewater, water, water pollution,