[High-efficiency Filtration] - This water filter elements set is a replacement for Gravity Filtration System filters. It has passed high-standard testing by authoritative institutions and efficiently reduces chlorine, fluoride, heavy metals, taste and odor, sediments, particles, and other harmful substances. Clean and healthy water can be enjoyed outdoors at any time. [Black Filter] - The black filter is made from high-grade materials. Compared with ordinary granular activated carbon, it has higher adsorption capacity and efficiently reduces fluoride, chlorine, and impurities. [Fluoride Filter] - The fluoride reduction filter elements adsorb fluoride, vanadium (V), pre-oxidized iron (III), and other residual typical heavy metal ions. [Perfect Compatibility] - This set of filter elements is compatible with Gravity Filtration System filters, including FOR Super Sterasyl, Traveler, Royal, Big, Imperial, and Crown Series. It is recommended to replace the water filter every 1000 gallons and the black filter every 6000 gallons for optimal performance, or based on water conditions. Material: Plastic Color: White + Black Package Contents: 2 x Water Filter 2 x Water Filter Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement may vary by 1-3 cm.