Ключевые слова: aluminum, analysis, arsenic, background, bleach, chemical, chlorine, close, closeup, cold, color, composition, concept, control, dirty, disinfection, drinking, exam, examination, faucet, flask, hand, hard, holding, home, iron, lab, laboratory, manganese, microbe, plumbing, pollutant, pollution, pouring, probe, quality, reagent, research, researching, sample, scientist, smell, soft, tap, test, turbidity, up, vial, water, worker,