Nowadays, Water faced a high shortage. SO, the scientists should find solution for this vital problem. Hence, seawater desalination is becoming a crucial intervention for mitigating water shortage in numerous middle east countries. Desalination technology is associated with nemours technological challenges that should be resolved to maintain plant sustainability and performance. For instance, seawater hardness is recognized as a challenge for recent large scale desalination plants. Numerous technologies including chemical treatment, adsorption and membrane filtration are some of the options for hardness removal and recovery of Ca++ and Mg++. So, the development and application of a new polymeric hydrogel exhibiting electrically tunable characteristics. The promising features of this novel hydrogel are elucidated in the removal and recovery of hardness causing elements in simulated seawater and brines. Moreover, the effect of some polymeric additives also will enhance the selectivity. It is concluded that using hydrogel is initially qualified for upstream seawater softening.

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