Product Details Fangrui Product Details [high-efficiency Filtration]- This Water Filter Elements Set Is A For Filtration System Filter, Have Passed A High-standard Examination By Authoritative Institutions, Efficiently Reduces Chlorine, Fluoride, Heavy Metals, Taste And Odor, Sediments, Large Particles And Other Harmful Substances. Clean And Healthy Water Can Be Enjoyed Outdoors At Any Time. [for Black Filter]- For Black Filter Is Made From High-grade High-quality Materials, Compared With Ordinary Granular Activated Carbon, It Has Higher Adsorption Capacity, Efficiently Reduces Fluoride And Chlorine, Filter Impurities. [for Fluoride Filter]- For Fluoride And Reduction Elements Filters Adsorb Fluoride, (v) And Pre-oxidized (iii), And Other Residual Typical Heavy Metal Ions. [ Compatible]- This Set Of Filter Elements Compatible With Filtration System Filters, Compatible With For Super Sterasyl And Traveler, , Royal, , Big, Imperial And Crown Series. We Recommend You For Water Filter Every 1000 Gallons And F