Ключевые слова: analysis, analyzing, bank, beach, biology, biotechnology, chemical, chemistry, coast, dirty, drinking, ecology, environment, environmental, equipment, experiment, filtration, flask, glass, importance, lab, laboratory, lake, nature, ocean, outdoor, pebbles, pollution, purification, purity, quality, research, resources, river, riverbank, sample, science, scientific, sea, seashore, shore, stone, technology, test, testing, toxic, tube, waste, water, water quality, waterfront,