[High-efficiency Filtration] - This set of water filter elements is a replacement for Gravity Filtration Systems, validated by reputable institutions. It effectively reduces chlorine, fluoride, heavy metals, unwanted taste and odor, sediments, and other harmful substances, ensuring clean and healthy water outdoors at any time. [for Black Filter] - The Black Filter is made from premium materials, offering higher adsorption capacity than standard activated carbon, effectively removing fluoride and chlorine along with other impurities. [for Fluoride Filter] - The Fluoride and Reduction Elements filter adsorbs fluoride (V) and pre-oxidized (III) as well as other heavy metal ions. [Perfect Compatibility] - This filter set is compatible with Gravity Filtration System filters. It works with various series such as Super Sterasyl, Traveler, Royal, Big, Imperial, and Crown. We recommend replacing the water filter every 1000 gallons and the black filter every 6000 gallons, or based on water quality conditions. Material: plastic Color: whiteandblack Package Contents: 2 x Water Filter 2 x Black Filter Only the items listed are included, other products are not part of the package. Note: Lighting and display differences may cause slight color variations from the actual item. Measurement errors of 1-3 cm are permissible.