Product review (4 stars): Water Sentinal does a great job
It works well, except that I did not know to soak it first.  My water was not working about 3 weeks after installation.  I unscrewed the filter, removed it, and then screwed it back on and it works perfectly now.  Not sure why, but was told that I should have soaked it prior to installation.  Not sure how or if those are related.