100 ppm is extremely high for ...

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100 ppm is extremely high for natural sources of water. Before removing silica, we need to know the nature of silica. Is silica present in colloidal form or in dissolved form. It is best to remove colloidal silica by precipitation using combinations of polyelectrolytes as coagulant and flocculants. The poly and its dose is best selected by way of Jar Test in laboratory. Hardness can be removed using Ion Exchange method.  Treatment also depends upon the treated water quality desired by you. For more informaiton, please provide the data as mentioned above. 

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