Product review (4 stars): Time is only factor for change.
It's a filter. It is my assumption it does what it's supposed to do. My only gripe is that my original filter was installed when the house was remodeled, before we purchased it. So, it required me to change the filter just three months after we began it's use (there is a chip attached to the filter that commmunicates to the smart refrigerator).  At $50 a pop, half use is unacceptable. Also, considering I travel for a living, I'm only there half of the time.