U can try cationic resins. ...

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U can try cationic resins.

Apart from ion exchange,there r adsorption techniques.Use of activated Alumina,carbon,bonechar,coir pith,fly ash etc reported.

Moringa oleifera seeds effectively used.

Precipitation techniques like Nalgonda is well known,combo of lime and alum etc.

CSIR-CMERI,Durgapur,West Bengal,India has patented an adsorption process.Also designs for household deflouridation available,economically effective.

Others include electrochemical and RO techniques.