Product review (1 stars): Not a Good Buy
Do not buy if you are expecting the same filtration standards NSF 42 & 53, they are not.
The item is listed as "Compatible" with such filters as the MWF, which would be fine if "Compatible" ONLY meant that it will fit.  If a company advertises something as "Compatible" it should mean that it fits AND, it performs as good if not better than the OEM.  These filters are ISO 9001 only (a simple pledge it's good), not with actual testing of NSF 42 & 53, which would make them "Compatible".