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- Ultraviolet light (UV) is at the invisible, violet end of the light spectrum.The water treatment industry uses a high-powered form of UV light called UV-C or “germicidal UV” to disinfect water.
- UV-C rays (photons) penetrate microorganisms and becomes absorbed by the DNA of the pathogen in the water being treated. The DNA is altered in such a way that the pathogen cannot reproduce and is essentially killed and cannot cause infection. This process of DNA modification is called inactivation.
- UV-C rays will destroy a minimum of 99.99% of harmful microorganisms, including E. coli, Cryptosporidium and Giardia.
- Unlike chemical disinfection the organisms are unable to develop any immune mechanism against UV light.
The degree of UV inactivation of pathogens is directly proportional to the UV dose applied to the water.
UV dose is the product of UV light intensity and exposure time and is expressed in mJ/cm2. NSF International has established a UV dose of 40 mJ/cm2 as the minimum UV dose required to ensure that all bacteria, viruses, Giardia and Cryptosporidium are killed or inactivated to a safe level.
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