Aimex 8 Stage Water Fluoride Filter Cartridges x 4Function: Activated Alumina (not aluminium) absorb the Fluoride up to 90% from Tap water Replace and Restores: Natural trace minerals required by our bodies such as iron, zinc, magnesium, potassium, and iodine. Gradually releases these mineral substances. Removes the Rubbish: Rust and organic sediment particles and stops the propagation of bacteria. Removes Chlorine, pesticides, organic matter, heavy metals, iron, nickel, mercury and arsenic, bad