Product review (5 stars): Very effective compared to baking soda and lasts a real 6 months.
I have ordered these multiple times and use in a large side-by-side freezer. Before using these, I was one of those folks who used baking soda. These are orders of magnitude better - to the point I question if baking soda made a difference at all. There are virtually no odors in the freezer- even the smell of stale cold air and ice cubes are gone.