Product review (2 stars): Restricted water flow within a month.  Bad filters.
Filters look legit in sealed package.  Installed first filter, and functioned normally for about a month.  Then my water flow reduced dramatically from the refrigerator water dispenser.  Dropped to about half the water flow.  Found out to test if filter is restricting water flow you simply remove filter and see if flow returns to normal.  Sure enough it did.  So figured maybe filter was defective or something with water supply.  Replaced and install second filter.  Sure enough one month later same thing happens.  Now I'm sure my water supply is not that contaminated that a filter that would last 6 months is clogged to the point of half the water flow after a month.  Also since the water flow reduction happens so sudden I feel this has to be defective filters causing the problem.