Product review (3 stars): Know what you need to filter out of your water before buying these filters
A good reason why they are so inexpensive is that they fit but they just don't filter too much.  For me with a great public water supply this is ok, don't get much crap anyway but if you need to filter out a lot of metals and contaminants, look for a much better filter.  The carton states that it filters out chlorine and not too much more