Ключевые слова: aerial view, architecture, chemical, circular, cistern, city water, dirty, distillery, drain, drainage, ecosystem, engineering, environmental, facility, factory, filter, filtration, hygiene, industry, liquid, outdoors, pipeline, plant, pollution, processing, pumping, purification, recycle, refinery, reservoir, round, sanitary, sanitation, sewage, sewage treatment plant, sludge, storage, stream, supply, sustainable, tank, treatment, usage, utility, waste, wastewater, water, water conservation, water treatment,