Product review (3 stars): Good tasting water but replacement design flaw
The water tastes great and according to the fact sheets filters out some particles and spores. However, there is a design flaw with this model, after a couple of filter replacements, the nubs at the top of the filter do not reach high enough to trigger the release in the manifold to release enough water and it dribbles out.

This problem happened to me too, but can be fixed with a garden hose plastic washer inserted at the top of the filter. Use a thin washer or a used washer for best results. See the discussion at "FixYa" site, search for "GXRLQR"