Patent ID: 7771600

Claim:
A method of treating water comprising the steps of: providing moderately saline water having substantially 0.05% or more by weight and having less than 1.00% by weight of the salts of Na, K, Ca, Mg, Fe, Cl, SO 4 , or CO 3 or combinations thereof; providing an ion exchange media saturated with a multivalent cation; passing the moderately saline water through the ion exchange media to produce an effluent having more multivalent cations and less sodium than the moderately saline water; providing a brine solution having more than 1.00% by weight of the salts of Na, K, Ca, Mg, Fe, Cl, SO 4 , or CO 3 ; passing the brine solution through the ion exchange media until the ion exchange media is sufficiently saturated with multivalent cations to again process moderately saline water having high sodium content; and utilizing the effluent.