This is the replacement filter for the Advanced 28 oz. plastic water bottle. This will also filter 99.9999% of impurities from 100 gallons of questionable water. Because of its EPA approved iodinated resin filter which removes virus and bacteria and chemicals from contaminated water. It is safe to use in the most challenging conditions such as muddy and stagnant waters. Perfect solution for disasters and water emergencies and even nuclear accidents. From survival to recreation this filter is supreme. Removes up to 90% of Fluoride. Make sure when you order your water bottle you add a couple of extra filters. It will not filter ocean water.