Product review (4 stars): It filters water - probably
Not sure what I can say about a water filter.  It fit the hole and did what the one before it did.  For all I know the water line doesn't go anywhere near it.  Meile fridges are "installed" so I can't see anything.

Water is clear and tastes like water so that's a good sign.  -1 star for the price being the same as the Miele website (but no shipping if you can wait 7 days for it to arrive).