The Carbon Block Filter Cartridge 4 Pack by Berkey Gravity Systems has a capacity of 3000 gallons and is designed to remove contaminants such as chlorine, sediment, rust, VOCs, trihalomethanes, and bromodichlorom. Made of carbon, this water filter cartridge features a carbon block filtration method for clean and safe drinking water. With dimensions of 2.25×9.75 inches, this brown cartridge is compatible with various Berkey models including Travel Berkey, Crown Berkey, Big Berkey, Waterdrop King Tank gravity system, Royal Berkey, and Imperial Berkey. Ideal for home and garden use, this water purification solution ensures a reliable source of clean water for your household.