Alexapure Water Filter, Compatible with BB9-2 Black Filters & PF-2 Fluoride Filters Combo Pack and Gravity Filter System - Includes 2 Black Filters and 2 Fluoride FiltersExcellent 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. 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