High Efficiency Filtration: The black water filter, with the same strong purification capacity as the original filter, can reduce up to 98.95% of chlorine, as well as heavy metals, sediment, chlorine, sand, rust, odors, and large particles in source water, improving water taste. Safe Materials: Our filters use high-quality natural coconut shell activated carbon. We strictly control filtration materials and produce them with lead-free, BPA-free materials to ensure excellent filtration performance and user safety. (The activated carbon is made from natural coconut shells. Please confirm if you have any allergies to it.) Economical Choice: We recommend replacing the black filters every 6,000 gallons per pair, which can save 45,000 water bottles. This saves you effort and money on frequent replacements. Compatible Models: The black replacement water filter can perfectly fit the original brand system, including Travel, Big, Royal, Imperial, Crown Series, Waterdrop King Tank, Propur Traveler, Nomad, King, Big Series, Gravity filter systems, Doulton Super Sterasyl ATC Super Sterasyl filters, and W9361122 W9361123 systems. The precise design of the washer and wing nut connects securely to prevent leaks. Multiple Applications: Suitable for indoor, travel, and outdoor activities, as well as water scarcity emergencies, whether at home or outdoors. The filter can provide you with healthy, clean, quality water.