Ключевые слова: black, building, cleaning, cleansing, construction, container, dirty, drain, drainage, ecological, ecology, environment, environmental, factory, filter, flex, flexible, hole, home, house, household, industrial, industry, installation, kitchen, liquid, maintenance, pipe, plastic, pollution, pvc, residential, sanitation, septic, sewage, sewer, sewer pipe, sludge, smell, storage, storage tank, system, tank, tanks, treatment, underground, waste, waste management, wastewater, water,