This Aquamira Frontier portable water filtration system works by trapping parasites and other pathogens in the activated carbon filter. Ideal for outdoor activities such as hunting, fishing, and hiking. Exceeds EPA guidelines for Giardia and Cryptosporidium removal. Removes heavy metals–uses no chemicals. All terrain bottle and easy-change replacement filters. Miraguard Antimicrobial Technology suppresses the growth of bacteria, algae, fungus, mold and mildew within the filter media.