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Due to the adverse effects of some metallic and non-metallic components on water properties, this paper describes the absorption of calcium, iron, silica, chlorine and water hardness from the water used in Jajarm alumina factory by using two types of alumina nanopowders. Both types of nano-alumina have similar properties except that they are made in two different ways. The time parameter was selected as the main variable in the adsorption process. To do this, first a certain amount of alumina nanoparticles were placed in a certain amount of water consumed by the alumina plant and then the sample was placed on magnetic stirrer for 60, 120, 180, 240, 360 and 480 minutes for complete homogenization. The temperature of the solutions was constant at 25 °C and the pH of the solutions was constant at 7.6. The results showed that the average absorption percent of silica, iron, calcium, hardness and chlorine by alumina A1 and A2 were 89.73-35, 100-100, 29.73- 32.43, 11.22-16.45 and 10.37-6.67, respectively. As the contact time increases, the adsorption increases. The results of the experiments also showed that alumina nanopowder can be used as an effective method for absorbing the mentioned species and reducing the hardness of aqueous solutions.