What is the difference between temporary and permanent hardness in water?

Hardness caused by the presence of positively charged metal ions and total hardness is measured as the equivalent of milligrams per litre of calcium carbonate. There are two forms of hardness, temporary hardness which only contains metal carbonates and bicarbonates, the most typical being calcium carbonate. Temporary hardness is precipitated from water when heated and is responsible for the furring of heating elements and metal pipes. Permanent hardness consists of non-carbonate based metal salts, and does not
precipitate out on heating.

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