Product review (5 stars): Works like a charm
After looking over all of the reviews, I decided to take a chance on this item.  I'm glad I did - works flawlessly.  I noticed some other reviews state that the O-ring is too big, and I initially had trouble fitting the filter because of it.  However, once the ring got a little water on it the filter installed easily - so my advice is to get the O-ring wet on purpose, and you shouldn't have any problems!