I thing, that it is no simple ...

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I thing, that it is no simple in one simultaneous process. Theoreticly the hardness and silica can be removed by jonic exchange proces (kationic and anionic). But it can be expensive, becaus the hardness is high. May be a good solution will be two stages process: first - removal hardness by chemical precipitation and second: removal of residual hardness and silica by jonic exchange ( a strong cation exchanger and strong anion exchanger).