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What is the composition of Permutit (Zeo...

What is the composition of Permutit (Zeolite)? How does it works in softening of hard water?

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Hydrated sodium aluminium silicate/ Sodium aluminium silicate……..1 It exchanges `Mg^(2+)` and `Ca^(2+)` ions for its `Na^(+)` hence soften the hard warter.
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