The McNett Frontier Replacement Bottle Filter RED-II-120 is designed for your Frontier Filtered Water Bottle. This Series II Red Line filter removes viruses as well as 99.9% of giardia, cryptosporidium, bacteria, chlorine, bad taste and odors. The Miraguard antimicrobial technology prevents growth of fungus, mold, mildew or bacteria inside the filter. It features a high flow rate at 500ml per minute. The filter element will last for 120 gallons. Bring one with you on longer trips so you can keep using your Frontier filter bottle.