About This [High-efficiency Filtration]: Replacement for BB9-2 Purification Elements Filters effectively reduce fluoride and arsenic, absorb odor, color, residual chlorine, heavy metals,they also reduce sediments and large particles effective in improving taste [Compatible with Berkey]: Replacement for BB9-2 black water filter, compatible with Big, Travel, Royal, Imperial, Crown, Light series gravity filtration system, has the same powerful purification capacity as the original brand [Black Purification Elements]: The water filter for bb9-2 replacement uses high-quality natural coconut shell activated carbon. We carefully select filtration materials and use lead-free, BPA-free materials to ensure excellent filtration performance and user safety [Durable Life Span]: For best performance, we recommend replacing the black filter every 6000 gallons per pair, depending on water conditions. Please note that TDS level does not fully indicate water quality and our filters do not reduce TDS value Virego - Risk free shopping brand, one of the most trustworthy brands on Amazon. Your issues will be resolved within 12 hours - Any problems with the product can be directly refunded in full or a new Overview Material : Replacement for BB9-2 Black Water Filters Product Dimensions : 10'D x 6'W x 2'H Item Weight : 1.3 Pounds External Testing Certification : NSF Product Benefits : Uses high-efficiency filtration to reduce chlorine, fluoride, heavy metals, taste and odor, sediments, large particles and other harmful substances for clean and healthy water.Uses high-efficiency filtration to reduce chlorine, fluoride, heavy metals, taste and odor, sediments, large particles and other harmful substances for clean and healthy water.