Product review (4 stars): Be careful when buying these 3rd party
It works.
I strongly caution against purchasing from 3rd party reseller.  I did and it came without the foil seal even thought seller claiming it was new.  I imagine the seal wouldn't be a good indicator anyhow because a disreputable seller could easily glue it on a used filter.  I'm not risking the health of me and my family by drinking water for months through a questionable filter.