The replaceable paper bowl liners for the feeder absorb excess oil from pet food, ensuring a clean bowl every day. The non-stick polyester and premium charcoal materials help keep the bowl hygienic by preventing bacteria buildup. For best results, replace the paper liner every 3 days. Using the disposable liners is easy: simply place the liner on the food tray and secure it with the reusable clip. When it's time to replace, just remove the old liner and clip and insert a new one. The and paper liners provide a sustainable, convenient solution to maintaining a clean and safe feeding environment for your pet.