Frequently asked question for Whole House UV Systems
About UV: What is ultraviolet (UV) light?
Functionality: How does UV work?
Who Needs UV: When do you need a Whole House UV light?
Chlorine Concern: Why is disinfecting your water with chlorine bad for you?
Pre-Treatment: Is pre-treatment of my water required for a UV system to work?
Energy Consumption: Does a UV system consume a lot of energy?
Choosing a System: How do I know what size UV unit I need?
UV Transmittance: What is UV transmittance (UVT)?
UV Lamp Life: How often should I change the UV lamp?
Taste: Will UV change the taste of my water?
Performance Test: How do I know the system is working?
Installation: Where should I install the whole house UV light?
System On/Off: Should I turn off the UV light when I am not using water?
Maintenance: What kind of maintenance is required for the whole house UV system?
|UV Transmittance: What is UV transmittance (UVT)?|
UV transmittance (UVT) measures water's ability to transmit UV light. The majority of deep wells have a UVT of about 85% or greater and most of municipal water supply have about 95% UVT. Surface water such as lakes, streams, ponds and springs may have about 75% UVT. Water with a lower UVT will require a larger UV system to deliver the disinfection performance required. Therefore, we recommend pre-treating water that has less than 75% UVT as it will affect the dosage* your UV system is capable of producing.
*Dosage: it is the intensity of UV light that is able to penetrate each liter of water measured in Millijoules per liter (m/J) that passes through the UV chamber.
|UV Lamp Life: How often should I change the UV lamp?|
The amount of UV light created by the lamp decreases over time, like light bulbs, UV lamps will dim with age and eventually burn out. So, it is essential to replace the UV lamp every 12 months. These whole house UV units are designed to generate the necessary UV light intensity for only one year of continuous use. The lamp will continue to burn long after, but it will not generate an adequate amount of UV light.
Note: The UV system is designed to operate continuously and should not be shut off for short periods of time, such as over a period of less than three weeks.
|Taste: Will UV change the taste of my water?|
No, UV will not change the taste or odor of the water. It does not add anything to the water and simply provides safe and reliable disinfection for your entire home. If your water contains hydrogen sulphide (rotten egg smell), the UV treatment may slightly improve the smell of the water.
|Performance Test: How do I know if the system is working?|
Systems are equipped with both audible and visual alarm signals to notify the homeowner if their system is not functioning properly. It is important to clean your lamp regularly and replace the UV lamp annually to ensure maximum performance.
|Installation: Where should I install the whole house UV light?|
This whole house UV unit works in tandem with a pre-treatment system that prepares your water for UV disinfection. The UV system must be installed after all water treatment equipment and we suggest installing the unit indoors at room temperature only.
|System On/Off: Should I turn off the UV light when I am not using water?|
No. The whole house UV light is designed to operate continuously. If the system is turned off, it may be possible for bacteria and viruses to travel through the water chamber and contaminate the distribution lines past the UV system. In addition, frequently starting and stopping the lamp and ballast may reduce its life span.
|Maintenance: What kind of maintenance is required for the whole house UV system?|
Every whole house UV system contains a UV sleeve to protect the UV light bulb. Overtime, minerals in the water may slowly form a coating on the sleeve during normal operation. This coating must be removed from the sleeve because it reduces the amount of UV light reaching the water, thereby reducing purification performance. Therefore, it is recommended to use scale removers such as Lime Away™ or CLR™, with soft, lint-free, and chemical-free cloth to remove any coatings adhering to the sleeve. Depending on the quality of the process water, we suggest you clean the sleeve regularly, about 3-4 times a year.
Cleaning the lamp is not necessary because the lamp itself is protected by the sleeve. The need to clean the sleeve will be indicated by the UV alarm on the UV-WHS-14-PLUS, UV-WHS-28, UV-WHS-47 models. If the process water entering the UV system is sufficiently filtered, then the cleaning requirement would be less frequent. If you have the whole house sediment filter upgrade option, the filter should be replaced every 6-8 months depending on your water quality.