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Q & A on Ultraviolet Systems (UV)

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Question+	Short Answer
Should I shut my system off when I am not using it?	No, the UV system should be left on whether you are using the water or not. The lamps age regardless of the amount of the water drawn through the system. By leaving the unit on, you will eliminate the potential problem of having contamination pass through the system while the unit is off.
Do I need to disinfect my municipal water supply?	If you use water that comes from a municipal water supply and wish to provide your family with an added "peace of mind", then we believe a UV system acts as an inexpensive insurance policy against the possibility of drinking bacteriologically contaminated water. *Click to view the complete answer*
Why do I need to disinfect my water supply?	Disinfection is recommended for all water supplies that are not protected by a municipal water source (ex. A private well). *Click to view the complete answer*
How does the UV light actually kill microorganisms?	UV does not kill microorganisms like chlorine does, but instead UV inactivates them. *Click to view the complete answer*
Does UV inactivate Cryptosporidium (Beaver fever) and Giardia?	UV is very effective against Cryptosporidium and Giardia. *Click to view the complete answer*
Will a UV system kill all microorganisms in my water?	All Sterilight systems are rated for a 4-log inactivation of bacteria, viruses and protozoan cysts under specific conditions. *Click to view the complete answer*
Is UV effective against E. coli?	Yes, E. coli requires a UV dose of between 6 -10 mJ/cm² to achieve a 4-log inactivation. This is well within the capabilities of Sterilight UV systems.
How do I clean the quartz sleeve?	If the quartz becomes stained, remove the sleeve from the reactor chamber and clean the OUTSIDE with a commercially available scale remover, such as Lime-Away or CLR. *Click to view the complete answer*
My lamp is still glowing blue; do I still need to replace it?	The UV light that is inactivating microorganisms in water is non-visible light, therefore the blue light that you see coming off a UV lamp is not what's doing the work. *Click to view the complete answer*
What is recommended maintenance for a UV System?	The lamp should be changed and the quartz sleeve should be cleaned or replaced on a yearly basis. *Click to view the complete answer*
Is UV light harmful?	You never want to expose your skin or eyes to the light from a UV system. UV light is non-visible however it can be harmful, similar to the harmful effects of UV light from the sun. *Click to view the complete answer*
What does "log inactivation" mean?	Log inactivation is the inactivation of microorganisms on a logarithmic scale. Microorganisms must be considered on a logarithmic scale due to their high numbers.
What is UV dose?	UV dose is the energy that is coming off the UV lamp over a specific time period. UV dose (or fluence) is a product of UV intensity and time. *Click to view the complete answer*
What is UV light?	UV light is at a wavelength of 254nm (nanometers), and is not visible to the naked eye. This portion of the electromagnetic spectrum is termed UV-C light or a germicidal wavelength. At this 254nm microorganisms undergo a genetic alteration which ultimately results in inactivation. *Click to view the complete answer*
Will UV change the taste and/or odor of my water?	No. *Click to view the complete answer*
I have colour in my water causing a low UVT, how do I remove it?	The most efficient way to remove tannins from drinking water is by way of an anion exchange system. *Click to view the complete answer*
What is UVT?	UV transmittance at 254 nm (which is the wavelength of light that UV lamps operate at) is a measure of the fraction of incident light transmitted through the water column. *Click to view the complete answer*
Does my water require pretreatment before my UV?	Yes, you must have your water tested prior to installing a UV systems. Water flowing through a UV system needs to be free from hardness, iron, turbidity, manganese and color (which can be called tannins). *Click to view the complete answer*
How do I disinfect water lines in my home?	A simple way to introduce a disinfectant (chlorine) into the lines is via the filter. *Click to view the complete answer*
What is a solenoid valve and can I hook one up to a UV System?	A solenoid valve is an electrically-activated mechanical valve that opens and closes when power is applied to it. This kind of valve can be installed and wired into a Sterilight system which is monitored. *Click to view the complete answer*

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