Product review (5 stars): Beats going to Lowes or Sears Outlet for the replacement.
This is the exact product that is offered by traditional brick and mortar stores, sold a lower price.

The air purifier system is a required filter on LG refrigerators. As a "Smart" refrigerator little sensors remind you to change to the filters (both air and water). After the sensor went off I looked for the product number online and ordered it. A few days later the filter arrived, I popped open the filter compartment swapped it out and went about my day.

Pros: This is made by LG, fits perfectly. Not sure if I would recommend an aftermarket filter unless it were made by a reputable company.

Cons: None.