Ключевые слова: canal, chemical, concrete, conduit, corrosion, dirty, drain, drainage, dump, ecology, environment, environmental, factory, floating, flow, flowing, fluid, garbage, generation, gushing, industrial, industry, liquid, mud, old, pipe, pipeline, polluted, polluter, pollution, pouring, river, rust, rusty, sewage, sewer, sewerage, sluice, stagnant, station, stream, substance, toxic, treatment, tube, unclean, waste, wastewater, water, water pipe,