Aluminum is the most common of the metallic elements and makes up nearly 8% of the Earth’s Crust. It is naturally occurring in the environment appearing as silicates, oxides and hydroxides as well as combined with other elements such as sodium and fluoride.

It can be introduced to the water supply by its use of aluminum salts as a coagulant in water treatment. Residual concentrations, when high, may be deposited into the water distribution system.

Aluminum has been connected to spleen and liver changes as well as heart and gastrointestinal tract issues in higher doses.

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