Product review (4 stars): Works great, I think, but not so cheap
I have to assume this filter does a good job as I really can't see exactly what this filter does.  I, however, would say this must be filtering impurities and minerals in water as the water would come out noticeably faster when I replace this with a newer one.  One draw back is this is not cheap and I don't know if I could send this to any recycling places unlike Brita ones that I could take to Whole Foods locations.