Ключевые слова: building, cleaning, construction, dirty, ecological, ecology, effluent, elimination, environment, environmental, fecal, filter, green, grey, hole, home, house, household, industry, installation, liquid, outdoors, pipe, plastic, pollution, purification, rural, sanitation, septic, sewage, sewer, storage, system, tank, tanks, treat, treatment, underground, waste, wastewater, water,