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NSF/ANSI Standard for Ultraviolet Microbiological Water Treatment Systems
Water Testing Blog
Bacteria
NSF/ANSI Standard 55:
“Overview: This standard establishes requirements for point-of-use (POU) and point-of-entry (POE) ultraviolet systems and includes two optional classifications. Class A systems (40,000 uwsec/cm2) are designed to disinfect and/or remove microorganisms from contaminated water, including bacteria and viruses, to a safe level. Class B systems (16,000 uw-sec/cm2) are designed for supplemental bactericidal treatment of public drinking water or other drinking water, which has been deemed acceptable by a local health agency.” (source)





January 21st, 2009 at 5:01 am
[...] NSF/ANSI Standard for Ultraviolet Microbiological Water Treatment … [...]
November 15th, 2010 at 8:25 pm
[...] The Trojan UVMAX Pro10 Ultraviolet System and other larger models manufactured by Trojan UV work very well as add-ons to other water purification systems (i.e. reverse osmosis systems). Many of the models have undergone rigorous testing by independent laboratories and certified to NSF/ANSI STANDARD 055 — Ultraviolet Microbiological Water Treatment Systems. [...]
January 20th, 2011 at 9:06 am
[...] No simple answer exists for that question, but one thing we definitely suggest people look for… a UV water treatment system that bears the NSF Mark. Specifically, we suggest checking to see that any unit under consideration has certified to NSF Standard 55. [...]
August 1st, 2011 at 9:05 am
[...] than bore you by quoting the official definition of NSF/ANSI Standard 55 for Ultraviolet Microbiological Water Treatment Systems, we would like to point out a simple, yet often overlooked, truth that many people forget when [...]
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