Product review (3 stars): filter fix for noise, vibration or low flow
These filters have a design flaw.  Sometimes they make noise, vibrate or have little flow.  This is due to the small plastic protrusion on the cartridge being broken off or too low to open the internal valve when screwing it in.  However there is a fix that I found on FIXYA by musicman77 that works perfectly and saves you the cost of buying a new filter system.  Just take a garden hose washer and place it around the center of the cartridge before you screw it on to the filter.  This opens the valve completely and it will work as good as or better than brand new.  Like magic.