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Published byPhilippa Bridges Modified over 9 years ago
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Further treatment of water
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Further treatment of water: chlorination Chlorination Chlorine is added into water Small portion is enough to kill micro- organisms Distillation needs high cost $$$$ Chlorine can kill micro-organisms in water. Chlorine is a chemical. It has a strange smell. It is used in swimming pool.
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Further treatment of water: fluoridation Food remains in mouth Bacteria grows and produce acids Acids attack teeth Tooth decay
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Further treatment of water: fluoridation Fluoride protects teeth Fluoridation Fluoride is added to drinking water We drink fluoride in water Prevent teeth decay
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Fluoride is added into water to protect our teeth but some people do not agree. Do you? Further treatment of water: fluoridation
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