This filter pack contains the filters which should be changed on a yearly basis.Contains the following filters:GAC (Granulated Activated Carbon) - Addresses chlorine, bad taste and odor, herbicides, pesticides, SOCs (Synthetic Organic Compounds) and VOCs (Volatile Organice Compounds)KDF/GAC - Addresses heavy metals, bacteria, sulfur, pesticides and nitratesUltra Filter- Addresses Cryptospordium, E.Coli, Giardia, Cysts, Viruses, Mold and Fungus, Spores, Coliform bacteria, and 99.9% of all pathogens
