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By adding this chemical, both temporary hard and hard water is removed

Water can run through an...........to remove Mg and Ca ions

This experiment is used to compare the hardness of water samples

This is where most of our drinking water comes from

To purify water it is first passed through a..........to remove large objects

This chemical is added at the final stage of purification

This method produces totally pure water

This is sometimes added to water and improves dental conditions