Product review (5 stars): The filter meets or exceeds Standard 42 and Standard 53.
Though it was not clear from the online information, the package insert says, "...water entering the system was reduced to a concentration less than or equal to the permissible limit for water leaving the system as specified in ANSI/NSF Standard 42 and Standard 53."

In researching it, some of the language said tested against Standard 42 and Standard 53. Not that the filter met or exceeded those standards.

The water tastes great as does the ice.