Aimex 8 Stage Water Filter Cartridges x 1Functions: Provides essential minerals: It replenishes the natural trace minerals that our bodies need, such as iron, zinc, magnesium, potassium, and iodine. It releases these minerals gradually into the water. Purifies the water: It removes rust, organic sediment, bacteria, and other harmful substances from the water. It also eliminates chlorine, pesticides, heavy metals, bad odors and tastes, and parasites such as Giardia. Easy to install: Before