You can re-use the air filter by removing odors from the air filter.
Pull out the upper fridge drawer.
Unscrew the screw at the air filter.
Press on the hooks at the air filter and then take it out.
Dry the air filter by using a hair dryer or by leaving it in the sunlight.
A natural palm wood powder is used for the air filter to increase deodorizing performance. Even if it falls off, it is not harmful. Wipe it off with a towel or cloth.