Dear  Aliakbar Ghadaksaz, ...

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Dear  Aliakbar Ghadaksaz,

 Alfred Lipshultz is right that RO is not efficient for nitrate, fluoride and other removal.
You need pre-treatment. This is possible using special mineral sorbents and ion exchange resins.
Please inform the source of the water, the volume of source water per day, the content of fluorides, nitrates and other contaminants in the source water. It is advisable to send a complete analysis of the source water.
Best regards,
Chemist-ecologist Vitalijus Gediminas.