The invention relates to treating unwanted moderately saline water for producinguseful water. The treated water is also suitable for human and livestock consumption.The process includes passing moderately saline waters having 0.05 % or more weightand less than 1.00% by weight of the salts of Na, Ca, Mg, Fe, Cl, SO, orCO or combinations thereof through an ion exchange media (Fig. 2).The ion exchange media is pre-treated to be saturated with multivalent cationssuch as calcium (Ca+) or magnesium (Mg+) ions (Fig. 2).After passing through the ion exchange media, the effluent has decreased sodiumcations and increased calcium and/or magnesium cations compared to the pre-treatedmoderately saline water (Fig. 2). As the moderately saline waters pass throughthe ion exchange media, the sodium content of the media rises as the multivalentcation content lowers until the media is unacceptable for further water treatmentand must be regenerated.
