Excellent reduction performance: Uses natural coconut activated carbon block and food-grade fluoride reducer as filtration media, ensuring excellent reduction performance that will not leach contaminants back into your water.(The activated carbon is made from natural coconut shells. Please confirm whether you are allergic to it.) High-efficiency filtration: Efficiently reduces chlorine, fluoride, heavy metals, taste and odor, sediments, large particles and other contaminants. Clean and healthy water can be enjoyed outdoors at any time. Longer service life: To achieve optimum performance, we recommend you replace the black filters every 6,000 gallons per pair and replace the fluoride filters every 1,000 gallons per pair, which will vary based on water conditions. The package includes two black filters, two fluoride filters and two priming buttons. Risk-free purchase: Our professional support team is 24 hour availble, if you have any issue about the product, please contact and get solutions right now. Compatible models: A good match for the original brand of BB9-2 black purification elements and PF-2 fluoride replacement filter. Interchangeable with the Travel, Light, Big, Royal, Imperial and Crown series. The manufacturer’s name has been used for reference purposes only. Black Replacement Filters *2