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'''Hard water''' is [[water]] which has certain dissolved [[ion|ions]] in it, predominately [[calcium]] ions.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
'''Hard water''' is [[water]] which has certain dissolved [[ion]]s in it, predominately [[calcium]] ions.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
==References==
==References==