Compatible Cat Water Fountain: Replacement filters are compatible with PETLIBRO Dockstream Cat Water Fountain PLWF005, PLWF115, PLWF105. In the Box: Includes 8 filters and 8 sponges. Usage Time: 4 months. All Day Purified Water: Completely removes hair, dirt, and other impurities, keeping the water fresh and clean all day long. Tips: Please soak the filter for 5 minutes before use. To maintain filter efficiency and pet health, it is recommended to replace the filters every 2 weeks. Please use official filters. Vertical Filtration: Every drop of water is filtered through multi-layer filtration to remove impurities and provide oxygen-enriched, better-tasting water. 1. Activated carbon eliminates bad odors. 2. Ion exchange resin removes heavy metal ions and softens water quality. 3. Non-woven fabric traps cat hair and impurities. 4. Built-in sponge in the pump filters debris to prevent blockages and damage