"Tested to NSF/ANSI Standards" means that our filter has been tested
to the standards for contaminant reduction established by the NSF/ANSI
organizations. When we submit our filter for testing, we specify that
our filters are tested to NSF/ANSI Standards 42, 53, 401, & P231
which are strict filtration protocols that are recognizable to our
customers.The filter has been tested in multiple independent
laboratories and we publish our most recent test data on our website for
everyone to see.