[High-Efficiency Filtration] - This replacement water filter set for gravity filtration systems effectively reduces chlorine, fluoride, heavy metals, odors, sediments, and other impurities, providing clean water for outdoor use. [Black Filter] - Made from premium materials, it offers superior adsorption compared to standard activated carbon, efficiently filtering fluoride, chlorine, and impurities. [Fluoride Filter] - Designed to adsorb fluoride and heavy metal ions for safer water. [Compatibility] - Works with gravity filtration systems, including Super Sterasyl, Traveler, Royal, Big, Imperial, and Crown series. Replace the water filter every 1,000 gallons and the black filter every 6,000 gallons for optimal performance (adjust based on water conditions). Material: Plastic Color: White + Black Package Includes: 2 x Water Filters 2 x Black Filters Note: Slight color variations may occur due to lighting or display differences. Size tolerance: +/- 1-3cm.