Product review (2 stars): Amazon's product details are not accurate and this is not an equal replacement to the GE filter
Currently this item is sold and shipped by Amazon with the following in the product description, "Additionally the manufacturer has tested this unit to ANSI/NSF standards 42/53 for performance."  This is inaccurate as the filters have NOT been certified for standard 53 (health effects) which is the more important of the two.  A few ways to confirm this:

1)  Check Water Sentinel's website.  Even they state the filter is only ANSI/NSF 42 certified.  If that's not enough to convince you...
2)  Certification to Standard 53 requires a manufacturer to provide detailed information on performance testing results for specific harmful contaminates (cysts, pesticides, insecticides, lead, VOC's, MTBE, etc).  No such information exists on Water Sentinal's website (or their parent company TST Water) nor in documentation included with the filter.

Given I don't just use the filter bypass in my fridge because I want to ensure drinking water safety these are worthless.  If this is important to you too then find another option that meets 42/53 (eg GE filter); I'll be submitting a 'product not as described' refund request and ask Amazon to email me a pre-paid return label.