What is the NSF/ANSI Standard 55?
NSF/ANSI Standard 55 refers to ultraviolet microbiological water treatment systems. It is the industry’s “stamp of approval.” Products certified under this standard have passed a stringent process that evaluates the product’s structural integrity, material evaluation, contaminant reduction claims and a review of its literature. The standard covers POU and POE ultraviolet systems and includes two optional classifications: Class A and Class B. • Class A systems are designed to disinfect and/or remove microorganisms from contaminated water to a safe level; and • Class B systems are designed for supplemental bactericidal treatment of public drinking water or other drinking water that was deemed acceptable by a health agency. As an alternative to testing NSF, the Water Quality Association also provides its testing services through its Gold Seal Program. The Gold Seal certifies to the same standards as NSF. WQA only awards the Gold Seal to those systems, components, or additives that have me
