[High-Efficiency Filtration] This water filter element set replaces Gravity Filtration System filters and has passed rigorous testing by authoritative institutions.<br> It effectively reduces chlorine, fluoride, heavy metals, taste, odor, sediment, particles, and other harmful substances.<br> Enjoy clean and healthy water outdoors anytime.<br> [For Black Filter] The black filter is made of high-quality materials and boasts a higher adsorption capacity than ordinary granular activated carbon.<br> It effectively reduces fluoride and chlorine, filtering out impurities.<br> [For Fluoride Filter] This fluoride and reduction element replacement filter adsorbs fluoride, (V), pre-oxidized (III), and other residual typical heavy metal ions.<br> [Perfectly Compatible] This filter element set is compatible with Gravity Filtration System filters, including FOR Super Sterasyl and Traveler, Royal, Big, Imperial, and Crown Series.<br> For optimal performance, we recommend replacing the water filter every 1000 gallons and the black filter every 6000 gallons, or based on your water conditions.<br> Material: plastic<br> Color: white+black<br> Package Contents: 2 x for water filter 2 x for water filter<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.