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Explain how calgon is used to remove per...

Explain how calgon is used to remove permanent hardness.

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Permuti is a technical name of Zeolite.permutit water softeners are sodium zeolites it helps remove hardness of water they take calcium ions from hard water and replace them by sodium ion thereby sofening the water.
`Na_2Z+Ca^2+ rarr 2Na^+ + CaZ`
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