These filter elements are designed to reduce heavy metals, fluoride, color, Bromine, Pesticides, and chlorine/chloramine in drinking water. They are constructed with materials which are FDA approved. The particle size used to accommodate filtration reductions of the following contaminants is 8x30 mesh. Metals adsorbed: Lead, Aluminum, Cadmium, Copper, Zinc, Iron, Manganese, Silver, Arsenic, Nickel, Mercury, and Chromium. The rate of adsorbtion is determined by contact time between the incoming water and time in the cartridge.