To soften the water, the majority of the filter pitchers use ion-exchange resin. It reduces the concentration of both Calcium and Magnesium in water by replacing their ions (Ca+ and Mg2+) with Sodium. As a result, water tastes better and forms less limescale.
The concentration of Magnesium in tap water is generally a few times less than that of Calcium. Therefore, it is recommended to preserve or restore certain levels of Magnesium in drinking water, given its positive effect on our health.