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Current IssueDecember 22, 2014
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May 2005: Volume 47, Number 5

Ultraviolet Water Disinfection -- It’s All About the Dose
by Rick Andrew

Mercury lamps have a very strong ultraviolet (UV) emission at the 254 nanometer (nm) wavelength. Energy at this wavelength is very effective at disrupting ribonucleic acid recombination in microorganisms, which renders them unable to reproduce. When these microorganisms are unable to reproduce, they are effectively prevented from causing illness to those who may inadvertently consume them—the microorganisms are inactivated...

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For earlier columns in this category, click on the link below or hit the 'List All' button.
Contaminant Reduction Claims on Reverse Osmosis System Post-Filters  April 2005
Efficient Certification with Product Bracketing  March 2005
Conformance to the NSF/ANSI DWTU Standards of Complete Systems Versus Components  February 2005
Cyst Reduction, Turbidity Reduction, Nominal Particulate Reduction, Class I  January 2005
A New Standard for Shower Filters  December 2004
Water Treatment Technologies: A Bottled Water Perspective  November 2004
Minimum Performance Requirements, Minimum Service Flow: Requirements that must not be minimized!  October 2004
Refrigerator Filters—Unique Products, Unique Certification  September 2004
Softener Certification -- Standard 44 Capacity Testing  August 2004
Structural Integrity and the DWTU Standards  July 2004
Lead and the Corrosion It Leaves Behind -- What the Washington, D.C., Case Taught Us  June 2004
How You Can Have an Impact on DWTU Standards  May 2004