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Be careful of impostors, this is the real deal. Not just a filter of debris. Lot's of filters use carefully selected wording, such as similar or replacement when not up to the specifications of this unit. I do however think it should be cheaper or someone should make a generic that would have the same level of NSF performance for impurities. This one is rated for the following; According to their MDS: System tested and certified by NSF International against NSF/ANSI Standard 42, 53, 401, and CSA B483.1 for the reduction of contaminants specified on the
Performance Data Sheet. Which are PHARMACEUTICALS- Atenolol, Trimethoprim, Estrone, PESTICIDES: Linuron, 2,4-D, Atrazine, p-Dichlorobenzene, Toxaphene INDUSTRIAL CHEMICALS: Benzene, Nonylphenol, TASTE & ODOR: Chlorine, OTHERS: Particulates, Class I, Turbidity, WATERBORNE PARASITES: Cysts, METALS: Lead, Mercury, MINERALS: Asbestos.. Hope this helps, I gave up looking for a cheaper one with same performance. Also write on your filter with a sharpie for a permanent log of when it was changed. While not easily seen, it's not like a note on a calendar that can be ignored or accidentally guesstimated later.