Now available as a gravity version, the Guardian is made to fulfill the requirements of the NSF protocol P248: it filters up to 99.99% of viruses, 99.9999% of bacteria and 99.9% of protozoa as well as sediment and microplastics. The 10 liter water bag makes this a very viable choice for group use. Just fill the bag, hang it from a tree branch, and wait a while. *The water bottles etc. shown in the extra images are not included.* - Two stage filtering: hollow fiber for basic filtering, active carbon for reducing tastes - Easy to fill from a stream, lake, faucet etc. - Easy cleaning - Filtering speed up to 500 ml per minute - Carrying bag included - Made in the U.S.A *Note!* A water filter or purifier tablets cannot remove the toxins created by algae bloom, and therefore do not make water containing said toxins safe to drink.