https://cee.technion.ac.il/members/ori-lahav/  Contact Ori Lahav   He has a technique extracts the Ca and Mg from the brine using IX resin and then desorbing them.

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https://cee.technion.ac.il/members/ori-lahav/  Contact Ori Lahav   He has a technique extracts the Ca and Mg from the brine using IX resin and then desorbing them.