Quick Answer
UV light is effective against viruses in water, but its effectiveness depends on various factors including the type of UV system, UV intensity, and exposure time.
UV Disinfection Basics
Ultraviolet (UV) light is a proven method for disinfecting water, including against viruses such as norovirus and rotavirus. In a whole-house water filtration system, UV disinfection typically involves a UV lamp emitting light at a wavelength of 254 nanometers, which is lethal to microorganisms. The UV system’s effectiveness is measured by its ability to inactivate 99.99% of microorganisms.
Choosing the Right UV System
When selecting a UV system for whole-house water filtration, look for a unit that meets or exceeds NSF International standards for UV disinfection. This typically involves a UV system with a minimum of 36 watts of power and a flow rate of 12 gallons per minute (GPM). A UV system with a higher UV intensity, such as 40 watts, may be more effective in inactivating viruses, but it also increases the risk of UV degradation over time.
Maintenance and Upkeep
Regular maintenance is crucial to ensure the effectiveness of a UV system against viruses in water. This includes replacing the UV lamp every 8,000 to 12,000 hours, depending on usage and water quality, and ensuring the system is properly calibrated and maintained by a certified professional. Additionally, the UV system’s quartz sleeve should be cleaned regularly to prevent the buildup of mineral deposits that can reduce UV intensity.
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