Product review (4 stars): can't tell the difference versus Samsung Aqua Pure filter
I've used 2 of these, then got Samsung Aqua Pure again,
but only because it was on sale. So I've used both Sentinel
and Samsung filters alternately and didn't noticed any difference.

 Another reviewer here pointed out though that he measured
the amount of filtration using an instrument(can't remember
its name) and said that Sentinel filter does not filter that much
versus tap water.