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Aluminium is not essential but could be harmful to human health, being associated with severe diseases of the nervous system, such as Parkinson's disease, amyotrophic lateral sclerosis (Lou Gehrig's disease) and Alzheimer's disease. Dissolved aluminium can become toxic to aquatic life and to the roots of sensitive plant species. Exposure to aluminium from water is a concern in Sofia region since its concentrations occasionally exceed the environmental quality standard for Iskar river, which is the main drinking wa...