Product review (1 stars): False claims
These filters are NOT NSF/53 certified, so the claims about removing the various health-related contaminants listed in the description are false.  The manufacturer is Yunda in Tianjin, China, and nowhere do they mention the claims posted by this seller.

Also, if you go the the NSF web site, Yunda is not even listed for the companies that have had products tested. Their NSF 42 certification was received through an 'independent lab'.