Product review (1 stars): Not certified and rattle on the inside
These filters are not "NSF42 Certified to Reduce the Most Contaminants" as stated in the description.  The included datasheet says they only reduce chlorine taste.  Also each filter rattles inside when you shake it.  I can't imagine they can filter water if the filter is rattling around inside the unit.  The EveryDrop by Whirlpool filter by comparison is made in the USA and actually independently certified to remove 23 specified contaminants at a specified percentage.  These have a great price but there is no company certifying them and no company standing behind them if the claims are false (which we know they are from the description).  It is not worth the risk to me.