Product review (1 stars): I would recommend that you not use these filters
I would recommend that you not use these filters. They do not have NSF/ANSI rating 53 which is needed for removal of contaminants. It does meet NSF/ANSI standard 42 but that is simply for smell and taste but does nothing to remove heavy metals and other chemical contaminants.
NSF/ANSI 42 establishes the minimum requirements for the certification of POU/POE filtration systems designed to reduce specific aesthetic or non-health-related contaminants (chlorine, taste, odor and particulates) that may be present in public or private drinking water.
NSF/ANSI 53 establishes the minimum requirements for the certification of POU/POE filtration systems designed to reduce specific health-related contaminants, such as Cryptosporidium, Giardia, lead, volatile organic chemicals (VOCs) and MTBE (methyl tertiary-butyl ether), that may be present in public or private drinking water.