Arm & Hammer Fridge Fresh Refrigerator Air Filter; Use Arm & Hammer Fridge Fresh to provide maximum odor elimination throughout your refrigerator and freezer to help keep your food tasting fresher longer! Made with the trusted odor-absorbing power of Arm & Hammer baking soda, this Fridge Fresh air filter can be used anytime and anywhere for an easy way to deodorize and freshen. The conveniently sized unit features a flow-through design to expose two times the baking soda compared to a traditional 1 lb. box freshener, and it comes complete with a super grip suction cup that allows the unit to be mounted on virtually any hard, smooth surface. To immediately begin freshening your refrigerator or freezer, simply find a clean, smooth surface for the suction cup to adhere to and firmly press the unit onto the surface and hold for 10 seconds. For best results, set up the unit close to sources of odors and airflow, and replace with a new unit every 30 days for optimal freshness!