Most of us in the developed world take it for granted that we have fresh, clean water piped to our homes. The water which comes out of our taps in different areas of the country may look very similar, but there are some very big chemical differences in it. These differences become obvious when we get washed.
When we wash ourselves with soap, the water in some areas of the country forms a really rich, thick lather easily. But in other parts of the country the water doesn't behave in this way. It is quite difficult to get the bubbles that the soap adverts promise us. This is because the water is hard.
Hard water not only makes it difficult to wash ourselves, it also makes it difficult to clean the bath or sink when we have finished. This is because hard water contains dissolved compounds which react with the soap to form scum. The scum floats on the water and sticks to the bath.
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