The main materials of the filter element are coconut shell activated carbon, ion exchange resin (food grade), and PP cotton. Its main function is to filter large impurity particles in the water, adsorb calcium ions and magnesium ions in the water, and remove odors in the water. At the same time, it can prevent hair that has fallen into the water tray from flowing back into the water tank, and prevent pet hair from getting entangled in the impeller and other parts.