Everpure Certified to the Highest Standards: Many Everpure filters are tested and certified to the highest standards by NSF International. Everpure has more than 200 models and model variation listed. And, Everpure was the first to pass NSF’s Life Cyst Test. A widely– accepted and recognized global third-party certification provider, NSF provides assurance that Everpure product perform up to their contaminant reduction claims for aesthetic and health effects and that they meet or exceed integrity standards.