ARM & HAMMER® Fridge Fresh® Refrigerator Air Filter. Place it in the
ARM & HAMMER® FRIDGE FRESH® Refrigerator Air Filter takes Baking Soda out of the back and out of the box - sticks up front and exposes 2x more odor-eliminating Baking Soda for full fridge freshness and full-time odor control. And with our patented replacement indicator that tells you when to replace it, foods will always taste as good as they should. It's like a fridge full of fresh air™.