Product review (1 stars): Inspect on delivery.
I must confess to not opening this item for more than 30 days from delivery.  When I did, I discovered a small piece of the filter was broken.  Just enough that when inserted in the refrig. The water ran at first and then stopped and backed up in the system.  Needless to say, I removed it but was still out the money paid.

You should always open and inspect even though the packaging looked good and I imagine this must have been a defect before the item was packaged.