We have discussed in our previous paper about an easy and low-cost ion reduction process of electrolytic solutions. In relation to this, we examined an ion removal technique using an active carbon with large surface area and create an electric double layer. Here, the adsorption rate change was dependent of on the process conditions. We proposed that this phenomenon exists in the pores of the active carbon’s surface. This is brought about by resistance which enables ion to be adsorbed in that area. We studied this phenomenon through an activated carbon electric double layer capacitor. As a result, we have discovered that the ion removal speed increases with increasing electrical conductivity of the ionic solution. When the ion concentration of the electrolytic solution is low, the ion removal rate decreases under constant adsorption speed. Here, we considered theoretical perspectives such as stopping the electric current temporarily and leaving it as is in order. This is done to let the electrode regain its current reception characteristics. We also decreased the current density for the electric charge rate to increase. Moreover, using these results as basis, we efficiently utilized the constant current anodizing process and we were able to lower the electrical conductivity to almost similar level of purified water.