Ключевые слова: background, box, circle, clean, construction, dirty, drain, drip, environment, environmental, equipment, factory, filter, filtration, flow, garden, grass, green, ground, industrial, industry, irrigation, lawn, metal, nature, outdoor, outdoors, pattern, pipe, pipeline, plant, pollution, pressure, production, pump, purification, recycling, removal, sewage, sewer, steel, storage, system, tank, technology, treatment, tube, valve, waste, water,