About This Efficiency Filtration: The replacement for berkey BB9-2 Black filters have powerful filtraiton performance, it can reduce 99% of chlorine, lead, PFOA, PFOS, taste and odor, large particles, sediment and more, effectively improving the taste of water Compatible Models: Replacement for BB9-2 black filter, compatible with Big, Travel, Royal, Imperial, Crown, Light series gravity filtration system. Note: If faucet not fully compatible, splashing may occur but won't affect product Safe Materials: Replacement of BB9-2 water filter has passed authoritative NSF/ANSI 42&372 certification. It uses high-quality coconut shell activated carbon as the filter medium, has good adsorption performance, to ensure efficient filtration capacity Cost-effective Choice: The replacement filters can provide up to 6000 gallons of fresh water treatment capacity, which is cost-effective. To achieve the best filtration effect, we recommend that you replace the filter every 6000 gallons Easy to Install: This Carbon Filters is easy to install without the need for any tools, and the gasket and butterfly nut are carefully designed to ensure no leakage in the connection Overview Material : Activated Carbon Product Dimensions : 3.5'D x 12.6'W x 7.5'H External Testing Certification : NSF Product Benefits : High-efficiency filtration, Reduces Chlorine, Effectively reduces chlorine and various water contaminants, improving the taste of waterHigh-efficiency filtration, Reduces Chlorine, Effectively reduces chlorine and various water contaminants, improving the taste of water Brand : Top Sojourn