About This ENHANCED PROTECTION: Fine carbon fibers add another layer of protection from any remaining materials after treatment such as rocks, grass, or inorganic material like plastic. IMPROVES TASTE: Activated carbon improves taste and odor, absorbs chemicals, and prevents particulate matter from passing through its fine pores. INCREASES LONGEVITY: Rather than replace your entire Puribag system, simply change out the inner filter element to optimize it's performance. Change after every 150 Liters or 15 uses with a packet of P&G Purifier. EASY INSTALLATION: The filter element can be replaced even while your Puribag is full of water, no additional tools necessary. Overview Material : Carbon Item Weight : 1.44 ounces External Testing Certification : NSF Product Benefits : Enhances protection, improves taste, increases longevity, and ensures easy filter replacement for clean water.Enhances protection, improves taste, increases longevity, and ensures easy filter replacement for clean water. Brand : PURIBAG