Product review (5 stars): I have been using these for over 2 years
I have been using these for over 2 years.
They work just as well as the expensive ones. In fact, due to my oversight the one I just replaced had 12 months on it. I noticed no taste or smell difference between the old and the new. That tells me they are working and working well.

Important Installation Tip!
Once the new on is installed, run about 1 gallon of water through the system to clear the black charcoal dust out. Once the water is clear again you are ready to roll. If you do not do this you may have ugly black ice cubes.

I would recommend these and I will continue to purchase. I bough a 3 pack this time so I will not need any for at least 18 months.