The Series IV GRN Line filter in any Series IV system (such as the Aquamira Frontier Max) for protection from the worst water you can find in any situation. This filter is certified to remove bacteria, Cryptosporidium and Giardia to EPA standards. It also reduces chlorine, chemicals while improving taste and odor and is certfied lead free to NSF/ANSI-372. 100 gallon capacity. Built in Miraguard Antimicrobial* Technology suppresses the growth of bacteria, algae, fungus, mold and mildew within the filter media.