U can try cationic resins. ...
Published by Suresh Kumar.S
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.