May b u need t run ur RO at ...

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May b u need t run ur RO at lower recovery since silica above 60 ppm is very high.

Ultra filtration works when there is non ionic colloidal silica,typically a case with such high silica.

Lime softening with Mg must give good results,at slightly higher temperatures for better absoption,given the high ph for such silica content...of course only in case of no acid feed for hardness issues