They work as advertised for flavor related filters like chlorine and haze, but they don't filter other health related things. Filters that require NSF/ANSI 53 certification typically include: heavy metals (arsenic, cadmium, chromium, copper, lead, mercury, and selenium), inorganics (fluorides and nitrates plus nitrites), and volatile organic chemicals (chloroform substitutes as well as individual organics substances). chemicals).
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