The First Years Clean Air Odor Free Filter Replacements. Diaper odors can be avoided with the use of the Odor free Diaper Disposal and the help of The First Years Clean Air Odor Free Filter Replacements. This pack of odor free filter replacement comes with two filters. Age: Newborn and up. Features: Custom formulated carbon filter to eliminate odors. Filter can last for 90 days. Compatible only with Clean Air Odor free Diaper Disposal. Can be installed with ease.