NSF certification (NSF International) was established in 1944, not for profit for the purpose of non-governmental organizations, dedicated to public **** health, safety, environmental protection in the field of standard-setting, product testing and certification, is the authority in the field of public **** health and safety. Currently Aksana water purifier through the NSF42 (taste test), 53 (health test), 401 (filtering emerging pollutants test) and P473 (filtering PFOA * & amp; PFOS * * test) four standard certification