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How is hard water formed?
Water from rocks, that pick up calcium ions or magnesium ions.
How is scum made?
When soap and hard water get mixed together.
How is scale formed?
When hard water is heated in kettles.
How do you remove temporary and permanent hard water?
Temporary - by heating it.
Permanent - by putting it into an ion exchange column.
What are the benefits of hard water?
Calcium ions - good for bones, teeth and reduces heart disease.