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The top documents tagged [permanent hard water]
Water and public health importance- Balasubramanya
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4 pictures 1 word : link?. Learning Objectives Content Identify how water becomes hard Start to compare and contrast soft water and permanent or temporary
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1 of 6© Boardworks Ltd 2012 Hard Water. 2 of 6© Boardworks Ltd 2012 What is hard water? Hard water contains dissolved calcium and magnesium compounds
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