This feature is only available on some models.
Replace the air filter:
Approximately every 12 months.
When the g icon turns on.
To purchase the air filter:
Visit your local dealer or distributor or contact the LG Electronics Customer Information Centre. For further assistance, visit our website at lg.com
Rotate the filter cover counterclockwise to release the tabs, and remove the cover.

Remove the filter from the inside of the cover by pressing the side of the filter in and pulling the center out.

Place the new filter inside of the cover with the side that says FRONT facing outward.

Align tabs a on the filter cover with hooks b on the refrigerator wall.

Rotate the air filter cover clockwise until the hooks engage and the cover locks in place.

Press and hold the Pure N Fresh button on the control panel for 3 seconds to reset the filter sensor.

If you wash the filter with water, the filter performance may also deteriorate.
Caution should be taken not to change the direction of the filter to be inserted into the filter cover.