The Aquasana AQ-5200 is also certified for 15 “emerging contaminants” that are increasingly found in public water supplies, including BPA, ibuprofen, and estrone (a form of estrogen used in birth control) and for PFOA and PFOS-fluorine-based compounds used to make nonstick substances, and which received an EPA Health Advisory in February 2019. These certifications include chlorine, which is used to kill pathogens in municipal water supplies and is the chief cause of “bad-tasting” tap water lead, which can leach out of old pipes and pipe solder mercury live cryptosporidium and giardia, two potential pathogens and chloramine, a persistent chlorine-ammonia disinfectant that is increasingly employed by filtration plants in the US South, where pure chlorine rapidly degrades in the warm water.
Wide availability: We especially wanted our recommended replacement filters to be easy to find for the foreseeable future.Cost-competitiveness: Filters have to be replaced regularly, so cost-per-filter and the replacement schedule give a sense of long-term cost-competitiveness.Certification is done on a strict pass/fail basis there are no certifications for “pretty good” or “close enough.” There are scores of potential water contaminants, and filters must be tested and certified for each one.
Total ANSI/NSF certifications: More is better.All of the filters we recommend are certified by NSF or WQA. But “independently tested to” and “certified” aren’t the same thing the former usually means a filter maker had its testing done by a non-certifying lab. Misleading claims: Unfortunately, many filter makers use phrases like “independently tested to ANSI/NSF standards” to imply that the filter is certified.
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