Magnetic field effect on CaCO3 precipitation is the key parameter in evaluating the effectiveness of Anti-scale MagneticTreatment (AMT). The purpose of this study was to investigate magnetic fields influence on CaCO3 precipitation inhigh and low super-saturated CaCO3 solution by varied pH CaCO3 solution using circulation flow fluid system. Theobservation results in the high super saturated solution (pH 8.5) showed the increase of precipited CaCO3 in magnetizedsolutions compared to those in non-magnetic solution during circulation process. In the low super-saturated CaCO3solution (pH 6.4) it was found that magnetic treatment increased CaCO3 precipitation after circulation process. In highsuper-saturated solution, magnetic field strengthens ion interactions, which reduce precipitation during circulationprocess. However, in low super-saturated CaCO3 solution, magnetic field weakens hydrate ion interaction whichindicated by decreasing of the conductivity of solution. It increases the precipitation of CaCO3 after the circulation ofmagnetization process has completed.