The one that is NOT suitable for the removal of \( \mathrm{P} \) permanent hardness of water is ...

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The one that is NOT suitable for the removal of
\( \mathrm{P} \) permanent hardness of water is

W
[JEE Main-2020(September)]
(1) Calgons method
(2) Ion-exchange method
(3) Clarks method
(4) Treatment with sodium carbonate
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