Permenant Hardness can be removed in two ways:
Both types of hardness can be softened by adding washing soda (sodium carbonate).
The carbonate ions react with the Ca2+ and Mg2+ ions to make a insoluble precipitate of calcium carbonate and magnesium carbonate.
The Ca2+ ad Mg2+ ions are no longer dissolved in the water therefore cannot make it hard.
Both types of hardness can also be removed by running water through 'ion exchange columns' which are sold in shops.
The columns have lots of sodium ions or hydrogen ions and 'exchange' them for calcium or magnesium ions in the water that run through them.
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