Product review (1 stars): "These filters have been observed as being marketed by the ...
"These filters have been observed as being marketed by the following distributors: Water Filter International, Clean Air Supply, StayPureFilters and Deltafill and on these distributor websites: sears.com, jet.com, shoponepurify.com, whoisworth.com and amazon.com with the NSF mark and/or various claims of NSF testing and certification and/or containing NSF certified components. OnePurify water filter products have not been tested by NSF and are not certified by NSF International. OnePurify LLC is not authorized to use the NSF mark or make claims of NSF certification or any other service of or from NSF."  Referenced from NSF certification enforcement page.

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