Ключевые слова: cartoon, clean, clipart, compartment, construction, descriptions, diagram, drain, drainage, ecology, environment, equipment, field, filter, flat, graphic, home, house, illustration, industrial, infographic, infographics, leach, outdoor, pipe, piping, plumbing, pollution, sanitation, scheme, scum, septic, service, sewage, sewer, sewerage, sludge, storage, system, tank, text, toilet, treat, treatment, tube, waste, wastewater, water,