Product review (5 stars): High quality carbon block filter
This filter is the one that fits in the Bosch refrigerator I bought.  It is carbon block filter.  I found that I would have to pass water through a Brita filter twice to remove the chlorine odor to the extent done by one pass through this carbon block filter.  The Brita filter is made of activated carbon granules.  It lasts me 6 months or so.