[Filtration precision up to 1 Micrometre]: This filter element uses high-quality coconut shell activated carbon as the filter material, providing filtration precision up to 1 micrometre. It efficiently removes various impurities such as sand, rust, sediment, and odors, while effectively reducing chlorine, with a chlorine reduction rate of more than 99%. [Compatible Models]: This filter is compatible with Berkey gravity filtration systems, including Travel, Grand, Royal, Imperial, and Crown Series. The precision design of washers and wing nuts ensures a secure connection and helps prevent leakage. No priming required; the filter can be installed and used immediately after replacement, reducing initial flushing time. [Durable Lifespan]: To maintain optimal performance, replace the filter every 6,000 gallons, depending on the quality of the source water. For proper function, fully submerge the carbon filter in water once a week to ensure the drip system operates correctly. [Cost-Effective Performance]: This filter delivers comparable filtration performance to leading brand filters, offering a cost-effective solution for high-quality water filtration. [Note]: Before installation, soak and rinse the filter thoroughly to remove any residual manufacturing particles. Color: Black Material: Coconut shell activated carbon Package Contents: 4 x Water purification filter elements Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement error is permitted within +/- 1-3 cm.