The only answer that makes ...

The only answer that makes sense is Alexandre’s answer; the conductivity number must be bigger than the TDS number!, the analysis shows that conductivity number smaller than the TDS number, that is wrong.

This water is impossible to treat with membranes because the osmotic pressure of this water is so high that you will not find a membrane, not pressure vessels for that matter that will tolerate such a high pressure.

So the answer to your question, no membranes are not an option.

Good Luck

Luis Inarejo