[Filtration Precision up to 1 Micrometre]: This filter element uses high-quality coconut shell activated carbon as the filter material, providing a filtration precision up to 1 micrometre. It effectively removes impurities such as sand, rust, sediment, and odor, while reducing chlorine with a removal rate of over 99%. [Compatible Models]: Compatible with 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 primer required; the filter can be installed and used immediately after replacement, reducing initial flushing time. Designed for reliable performance. [Durable Lifespan]: For optimal performance, replace the filter every 6,000 gallons, depending on water quality. To maintain proper function, fully submerge the carbon filter in water once a week to support siphoning in drip systems. [Afable and Cost-Effective]: These filters deliver comparable filtration performance to leading brands at a more afable price, offering high-quality water filtration with cost efficiency. [Note]: Before installation, soak and rinse the filter thoroughly to remove any residual manufacturing dust. Color: Black Material: Coconut shell activated carbon Package Contents: 4 x Water purification filter elements Note: Light reflection and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.