The Katadyn BeFree is a super light solution to water filtering needs on the go. Using the BeFree is easy: fill the soft, collapsible bottle with water and put the top on. As you now drink through the sports top of the bottle, you'll receive refreshing, filtered water. - Replaceable filter element - Volume 0.6 liters - Filter system: EZ-Clean Membrane - Filters 99.9% of protozoa - Filters 99.9999% of bacteria - Filter life: up to 1000 liters (depends on water quality) - Bottle: Hydrapak SoftFlask Don't allow your filter to freeze. Water expands as it freezes and may break the filter element. *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.