Product review (5 stars): ANSI 53 Filtration better filter for your health and money
After doing some thorough research, I decided to get the ANSI 53 filter which really had a much better tasting water than the ANSI 42 filter that was replaced, which was the standard filter in the refrigerator.  NSF/ANSI 42 covers aesthetic reduction claims while NSF/ANSI 53 covers health-related reduction claims, and thus a better tasting water.  I am glad I invested a few dollars more for a better and healthier filtered water.

NSF/ANSI Standard 42 covers POU and POE systems designed to reduce specific aesthetic or non-health-related contaminants (such as chlorine, taste and odor, and particulates) that may be present in public or private drinking water. The scope of Standard 42 is to establish minimum requirements for material safety, structural integrity, product literature, and aesthetic, non-health related contaminant reduction performance claims.

NSF/ANSI Standard 53 addresses POU and POE systems designed to reduce specific health-related contaminants that may be present in public or private drinking water. Standard 53 establishes minimum requirements for material safety, structural integrity, product literature, and health related contaminant reduction performance claims. NSF tests and certifies under Standard 53 if a filter system reduces a significant amount of a specific harmful contaminant from drinking water. Such hazardous contaminants may be microbiological (including filterable cysts), chemical (including disinfection byproducts, pesticides, herbicides, and insecticides), or particulate in nature. NSF may certify that a DWTU may be effective in controlling one or more of the health effects contaminants. By carefully reviewing the performance data sheet for a product, you will be able to determine whether the device is effective in reducing many pollutants or just a few.

Hope the above details clarifies the difference between the two carbon filtration systems and explains why I chose the latter.

As for replacing the filter it took less than 20 seconds, just remember to remove the seal at the end of the filter before snapping it in and turning it to lock it in place.