Premium multi-stage media ultra dual filtration system dual filtration system is made up of multi level stage specialized media filter and a premium activated carbon filter. The premium activated carbon filter is structured to improve the reduction of heavy metals and fluoride found in many city water sources. The silver activated carbon portion of the filter kills bacteria and keeps them from growing within the filter and being passed through to the electrolysis chamber. The multi level stage sediment filter reduces additional sediment particles in the water maintaining the life and performance of your Water Ionizer. It contains of membrane which will removes bacteria.