The core function of the BeFree series AC bottle is to filter pathogens and parasites from water using a fiber filter, while also featuring an activated carbon element to reduce taste and chemicals. You can remove or attach the activated carbon element depending on the situation. Thanks to BeFree EZ-Clean Membrane technology, the filter is easy to clean without any tools. The BeFree AC is an excellent companion for hikers, travelers, and those preparing for water crises. It is extremely lightweight and boasts the world-renowned Katadyn quality. - The activated carbon element reduces unpleasant tastes and filters chemicals (e.g., muddy taste, chlorine from tap water). - The drinking nozzle is protected by a flip cover. - Filtration rate: max. 2 liters per minute. - Fiber filter lifespan: up to 1000 liters. - Activated carbon filter lifespan: up to 200 liters. - Filter lifespan depends heavily on the cleanliness of the water being filteredalways choose the cleanest source available.