Product review (5 stars): It does the job
Other reviewers have a rough time with this filter. It is activated charcoal with exposure on one side under the butter safe. It slides in there and does it's job well. You could do similarly, perhaps cheaper, with a box of bicarb (baking soda). which also has a limited surface area exposed. But for how this refrigerator is designs with valuable shelf space - I'd go for it.