Product review (1 stars): Made in China, and rated only for chlorine and odor...a real filter (like 3M) will be rated for many other contaminants
Cheap Chinese filter that is tested against NSF/ANSI 42 for only ONE parameter: "Chlorine Taste and Odor" according to the performance data sheet.  The 3M (TM) made version (sold under Maytag brand) is tested against NSF/ANSI 42 and 53 for SIXTEEN parameters across TWELVE contaminants, including lead, mercury, and cysts.  The seller's assertion that the internal carbon filter is made in US and shipped to China to be included in these "Made in China" filters is dubious, and should be documented by the seller or removed from the product listing.  I've returned mine so Amazon will make them eat the cost, hopefully changing their behavior with regards to the misleading statement about this being a US made filter.