This paper presents the observation of magnetization process variables influence the conductivity of a solution of FeSO4, MnSO4, MgCl2 and CaCl2. Some of the survey results reveal that there has been a decline in the rate of particle formation FeSO4, MnSO4, MgCl2 and CaCl2 of the ions in the hard water sample magnetized. The research method in this paper is to test the conductivity of a solution of FeSO4, MnSO4, MgCl2 and CaCl2 before and after a given pulse electromagnetic field with a concentration level of 0.1 M. Tools for generating an electromagnetic pulse is Electromagnetic Water Treatment (EWT) with pulse electromagnetic field of 9.3 mT. Testing the level of conductivity of the solution using the Bench Conductivity Meter has been calibrated by Control Company with Certificate No. 4163-4997748 and traceable to the National Institute of Standards and Technology. Tests is done by looking at the time function of the conductivity of the solution FeSO4, MnSO4, MgCl2 and CaCl2. The test results show that pulse electromagnetic fields can affect the conductivity of the solution is 74% FeSO4, CaCl2 by 67%, while the MnSO4 solution has a lower conductivity difference of 6% compared to MgCl2 and due process of magnetization, causing instability in the solution ionic bond.