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The Aquasana AQ-4000 is part of the Water filters test program at Consumer Reports. The Aquasana AQ-4000 Water filters features and specs include Filter cost, NSF certified for lead removal, NSF certified for organic contaminants removal, Filter-life indicator. In our lab tests, Water filters models like the Aquasana AQ-4000 are reviewed on Overall score, Chloroform removal, Clogging, Flow rate, Lead removal. Consumer Reports subscribers share reviews of the Aquasana AQ-4000 based on personal experience. The user reviews of the Aquasana AQ-4000 include star ratings, pros, cons, best uses, and a bottom line review to help guide your purchasing decision of the Aquasana AQ-4000.