The FoodCycler Bucket Lid Filter 3-Pack is designed to help you store your food waste in your removeable bucket for days at a time without having to worry about odors. A polyester substrate coated with a liquid carbon captures odors inside the collection bucket lid. These filters are easily removable and replacecable. We recommend replacing your lid filter every 3-4 months and is not dishwasher safe. Do not submerge or soak filters in water. There is no warranty on this product.