Product review (2 stars): Not NSF Certified for Filtration
These are not NSF certified for filtration of any contaminant.  The OEM LG filters are NSF/ANSI standard 42 and 53 for the reduction of contaminants which have aesthetic and health effects.  The NSF/ANSI standards listed on these filters are 51 and 61, which only certify that the materials used to manufacture the product are food-safe. These filters may or may not be effective at removing harmful contaminants.

See the NSF website for easy to understand and detailed information about what these standards actually mean.