Usage Tips: [Affordable Filter Replacement] This water filter replacement is designed to replace BB9-2 black purification elements and PF-2 fluoride filters in gravity water filtration systems. Compatible with Travel, Big, Royal, Empire, Crown, Propur Traveler, Nomad, King, and Big Series gravity filter systems. [Water Quality Performance] The filter effectively reduces chlorine, fluoride, heavy metals, taste and odor, sediment, and large particles by up to 99%. Filtered water is clear, neutral in taste, and virtually odorless. [Food-Grade Materials] The BB9-2 black filter and PF-2 white filter are made from food-grade materials. The PF-2 filter uses natural coconut shell activated carbon for fluoride reduction. Water passes through granulated activated charcoal to enhance taste. [Recommended Replacement Interval] Replace the PF-2 fluoride filter after approximately 1,000 gallons and the BB9-2 black filter after approximately 6,000 gallons under normal use conditions. [Applications] Suitable for home, travel, outdoor activities, and emergency preparedness. Can be used with tap water or untreated water sources such as lakes and streams. Color: Black Material: Plastic Size: Approximately 21 x 5.6 x 3 cm Package Contents: 2 x filter elements Note: Color appearance may vary slightly due to lighting and screen settings. Measurement tolerance: ±1–3 cm.