4 Months Pet Fountain Filter Replacement Set: Includes 8 filter replacement and 8 sponges, individually packaged. Compatible exclusively with PETLIBRO cat water fountain Dockstream PLWF106/PLWF116/PLWF105/PLWF115/PLWF005/PLWF305 (2.5L-3L). Fresh water in every drop: 4-Layer Filtration in Cat Fountain (1) Non-woven fabric traps hair and debris in your pet water fountain; (2) Activated carbon neutralizes odors; (3) Ion exchange resin softens water and removes heavy metal ions; (4) Foam filter extra protection by catching fine debris; Easy to Swap and Maintain: No tools needed when changing cat water fountain filter - soak 5 mins, rinse 30 secs, swap in seconds. For optimal Use, replace the PETLIBRO filter every 2 weeks and clean the fountain weekly. Keeping the cat fountain filter clean for healthy drinking. Safe Hydration for Your Pets: The PETLIBRO water fountain filter made from food-grade materials to ensure safe, clean hydration and give you peace of mind. New cat water filter and Fresh water increase pet hydration, reducing urinary risks. Ensure Use Offical PETLIBRO water fountain filter: Specially Designed for PETLIBRO Dockstream 2 WF116/106. Off-brand cat fountain filters may cause leaks/pump failure in PETLIBRO automatic water dispensers. If worried about forgetting, Try Subscribe & Save on Replacement Filter: Get fresh cat fountain filters delivered right to your home or company on schedule. Note for Multi-Pet Households: If you have multiple pets, clean the pet water fountain and replace filters more frequently to maintain fresh, flowing water all day.