UV Water Purification System — Ultraviolet Germicidal Irradiation for Pathogen Inactivation, 40 mJ/cm2 Dose Standard, No Chemical Residual (NSF 55 Class A) — water/air safety profile

What is this product?

Ultraviolet (UV) water purification systems use UV-C radiation at 253.7 nm wavelength (mercury vapor lamp emission peak) to inactivate waterborne pathogens by disrupting their DNA through thymine dimer formation, preventing replication. NSF 55 Class A systems deliver a minimum UV dose of 40 mJ/cm2 — sufficient to achieve 4-log (99.99%) inactivation of bacteria (E. coli, Salmonella, Legionella), 3-log inactivation of viruses (norovirus, hepatitis A, rotavirus), and 3-log inactivation of protozoan cysts (Cryptosporidium, Giardia) that are resistant to chlorination. UV treatment adds no chemicals, produces no disinfection byproducts, does not alter water taste or chemistry, and requires no contact time (treatment is instantaneous as water flows past the lamp). These advantages make UV systems the preferred disinfection technology for private well owners (43 million Americans). Limitations include: UV does not remove chemical contaminants (lead, arsenic, PFAS), requires pre-filtration for turbid water (particles shield pathogens from UV, requiring <1 NTU turbidity), provides no residual disinfection (no downstream protection against recontamination), and mercury lamp disposal requires proper handling.

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