CamelBak Replacement Activated Carbon Filter Filtered by LifeStraw - The Replacement Activated Carbon Filter is compatible with the Crux 2L Reservoir Filtration Kit filtered by LifeStraw or the Reservoir Filter Kit accessory. Chlorine is reduced and bad odor and taste are removed when paired with an existing Hollow Fiber Filter and used as part of the two stage LifeStraw filtration system.