Viqua Sterilight UV desinfectie algemene productinformatie (Engels)

Water Issues 

Water Matters

Water is sometimes referred to as the universal solvent, dissolving varying amounts of everything it comes in contact with. This leads to the mineral content found in groundwater, which can result in visible problems, termed aesthetic issues. 

Aesthetic Issues 

Although the term sounds harmless enough, these issues include scenarios where expensive damage can be caused to household and commercial appliances if preventative steps are not taken. 
The problems associated with water hardness are well known to many – excessive detergent use, fabric damage, staining, and, ultimately, severe damage to water heaters and boilers. 
Hard water contains high levels of dissolved calcium (and magnesium) bicarbonate, which becomes solid when the water is heated – hence the scale damage that can occur in hot water appliances. Hard water problems are normally eliminated by installing a water softener, which can also take care of low levels of dissolved iron that cause unsightly orange staining. 
For more severe iron problems together with manganese staining and sulphur odour, specialized water treatment units are available (see Water Conditioner section of our catalogue). 
Turbidity in water supplies is caused by suspended particulates, which can be readily removed with good ltration. The most popular set-up is a high-grade, plastic lter housing containing a disposable lter cartridge manufactured from string wound, melt-blown, or pleated food grade polypropylene, available in various micron ratings. The lower the micron rating, the lower ( ner) the particle size that can be removed. 

Microbiological Issues

Water can also become contaminated through environmental events, such as agricultural run-off, leaking septic systems, ooding, and pollution incidents. In addition to potential toxins entering the water supply, there is the very real issue of microbiological contamination leading to the presence of bacteria, viruses, and parasitic organisms, such as Cryptosporidium and Giardia (beaver fever), in drinking water supplies. 
Municipal water supplies are treated to protect consumers from microbiological contamination, but the protection of private wells is the responsibility of the homeowner. While chlorine can be used to deal with temporary contamination of wells, a more permanent solution is to install an ultraviolet (UV) disinfection system. Installing a UV disinfection system on a municipal water supply provides peace of mind, especially in the event of boil water advisories, which occur when municipal treatment systems are compromised by infrastructure failure or ooding. 

Application of UV

UV has been used for disinfection purposes for more
than a century and is well proven to be effective against microorganisms, particularly the dangerous, chlorine-resistant parasites Cryptosporidium and Giardia. More than 400,000 people became very sick and more than 100 died in the 1993 Milwaukee Cryptosporidiosis (crypto) outbreak.
UV disinfection inactivates pathogens, rendering them
incapable of causing illness, and does so without the use of
chemicals, avoiding the risk of unhealthy by-products being
produced. Although a simple process, UV has only become
truly effective through intensive research and technology
development carried out by trusted organisations committed
to providing safe, practical water treatment solutions. UV disinfection is now used in many large cities around the world, including New York City, Paris, and Rotterdam.

Frequently Asked Questions

Why do I need to disinfect my water supply?
Disinfection is recommended for all water supplies that are not already proven to be disinfected. Unfortunately, the microbiological quality of your water supply can change due to environmental conditions. By providing your own disinfection, you are taking responsibility for ensuring the safety of your water supply for you and your family.

Is UV effective against the protozoan parasites Cryptosporidium (crypto) and Giardia lamblia (beaver fever)?
Yes, UV is known to be the best available technology to treat these protozoan cysts, which are highly resistant to chlorine disinfection. In addition, the UV dose level required to inactivate these cysts is relatively low, at 10 mJ/cm2 for 99.9% reduction. Recommended  ow rates for VIQUA UV disinfection systems are based on a UV dose level of 30 mJ/cm2. (See ‘What is UV dose?’)

Does UV inactivate water borne E. coli?
Yes, E. coli requires a UV dose of 6 - 10 mJ/cm2 to achieve 99.99% disinfection. As noted, VIQUA UV systems use a UV dose of 30 mJ/cm2 (@ 95% UVT) as the basis for  ow rate sizing. (See ‘What is UV dose?’)

What is UV dose?
UV dose or  uence is the amount of UV energy imparted to the water as it  ows through the disinfection system. It’s related to UV lamp wattage but also how well the UV is transmitted through the water, which is measured as UVT. (See ‘What is UVT?’)

What is UVT?
UVT is the proportion (%) of the UV energy from the lamp that can penetrate water  owing through the UV system. Water quality varies and this affects UVT. Turbidity in the water reduces the transmission of light while contaminants that give rise to colour (for example, in lake water) reduce UVT due to absorption of the light. Water drawn from a dug well or surface source (lake, river) may have UVT in the 55% - 80% range, while water drawn from a drilled well typically has UVT in the 85% - 97% range. Published  ow rates for VIQUA systems are based on water with UVT of 95%, except for NSF-validated systems which use UVT of 70% as the basis for  ow rate calculation. Different levels of UVT can be accommodated by sizing the UV disinfection system accordingly.

How do I know the UV system is working?
All VIQUA systems are equipped with “lamp-out” monitors which indicate lamp status. Monitored systems equipped with a UV sensor indicate the amount of UV that is being imparted to the water and will go into alarm if the UV dose is insuf cient.

Do I need to disinfect my municipal water supply?
Municipalities work very hard to provide safe, disinfected water for their customers. This is quite evident when you consider the dif culties involved in providing safe drinking water through a vast distribution network. However, once the water has left the treatment facility, it moves through an aging and crumbling infrastructure system which can lead to contamination. There are also occasions when circumstances lead to “Boil Water Advisories”. If you wish to provide your family with added peace of mind, then a UV disinfection system is an affordable insurance policy against the possibility of drinking water contaminated with microbes.

How much does it cost to operate a UV system?
UV systems are very economical to operate. A typical whole house UV system uses the same power as a 40-Watt light bulb.

Will UV change the taste of my water?
No, UV is a physical disinfection process, so it does not add anything to or change the taste/odour of the water. It simply provides safe, reliable disinfection without the use of chemicals. In rare circumstances, untreated sulphur odour can become more noticeable after UV treatment.

Should I shut off my system when I am not using it?
No, the UV system should be left on whether you are using the water or not. By leaving the unit on, you will eliminate the potential problem of having contamination pass through the system while the unit is off. However, if water is drained from your disinfection system (e.g. winterizing), your UV system must be turned off.

What are the maintenance requirements?
UV lamps have a useful life of approximately 9000 hours, which means that the lamps require annual replacement in a full time residence. The UV light will be illuminated beyond one year, but there may not be enough UV energy to provide adequate disinfection. There is a quartz sleeve that surrounds the UV lamp which must be kept free from hardness or iron deposits by cleaning with a lime removing solution and soft, lint-free cloth. Proper maintenance of any installed pre-treatment equipment is also required.
Do I need to consider the quality of my water prior to the UV?
Yes, for UV to be fully effective, water quality parameters should be as follows:
                 • Iron < 0.3 ppm (0.3 mg/L) • Hardness < 7gpg
• Turbidity < 1NTU
• Manganese < 0.05 ppm (0.05 mg/L) • Tannins < 0.1 ppm (0.1 mg/L)
• UV transmittance > 75%
Note: If you are unsure of the quality of your water supply, it is important to have the water tested. A UV transmittance test (UVT) is strongly recommended for surface/shallow well sources or water that is even slightly coloured. To  nd out more information about UVT tests, please contact VIQUA or your local water treatment specialist.

Do I need any pre- ltration?
Yes. Microbes can potentially be shielded by suspended particles (turbidity) in the water supply, so it’s necessary to  lter the water to remove these particles. A high quality  lter system with a rating of 5 microns is recommended. Filtering to a lower micron rating (for example, 1 micron) will remove smaller ( ne) particulates but can result in undesirable restriction of water  ow. Several VIQUA UV systems incorporate pre- ltration for easier installation and maintenance.

How do I control the water  ow?
The most important consideration is not to install a UV system in situations where the recommended maximum water  ow can be exceeded. In situations where this is a possibility,  ow restrictors are available to prevent that from happening. The best approach is to choose a UV system that is sized appropriately for the maximum possible  ow (present and future) of your water supply equipment.

Should I install a by-pass?
Although not essential, the installation of simple by-pass plumbing allows for emergency use of the water in case the UV unit is required to be removed from service. A simple by-pass assembly with three isolation valves can be installed easily.

Will the UV system restrict my water pressure?
No, UV systems are designed with inlet/outlet ports correctly sized for the speci c application. Whole home systems typically have 3/4” or 1” connections, while smaller point of use options have 3/8” or 1/2” connections.

What size system do I need?
VIQUA offers different models to suit widely varying water  ow demands. An average whole home UV system ranges in size from 5 to 12 gpm. Determining the maximum  ow rate of your pump will determine the UV model best suited to that  ow rate. It is important to not undersize the UV system. If in doubt, it’s always better choose the next largest size.

How much space does a UV system require?
As the UV lamp and/or sleeve need to be periodically removed from the reactor chamber, you must allow at least double the length of the disinfection system to facilitate removal.

Should I be concerned about the adequacy of my electrical system?
VIQUA systems incorporate proprietary electronic controller technology, which provides constant output voltage regardless of variations in input frequency or voltage, providing consistent UV output. However, in regions that experience signi cant power  uctuation, the use of high-quality surge protection is recommended. UV systems should always be connected to a dedicated electrical outlet protected by a GFI (ground fault interrupter).

What materials are used in VIQUA UV systems?
The disinfection chamber that carries the water  ow is manufactured from passivated stainless steel. Both the UV lamp and the surrounding sleeve are manufactured from high purity fused quartz (not plain glass). All seals that come into contact with the water are FDA and NSF compliant.

What is the warranty on VIQUA UV systems?
Stainless steel chambers are warranted against leakage due to manufacturing defect for 10 years. System controllers are warranted against manufacturing defect for 3 years (5 years for PRO series, H & K variants), while UV lamps, quartz sleeves, and UV sensors are covered for 12 months.

Make Sure It’s VIQUA 

Homeowners trust us to provide them with a safe, effective water disinfection system. We’re the experts, and it’s up to us to educate them on the importance of using only VIQUA replacement lamps with their VIQUA UV disinfection systems. 

UV lamps generally need to be replaced after 9000 hours of continuous use. By letting your customers know how important it is to annually install a new lamp designed by VIQUA for their VIQUA UV system, you’ll not only be helping to ensure proper system performance and safety, but you’ll be positioning yourself for increased and repeated lamp sales. Let us help! When your customers register their new VIQUA UV system at, they can request electronic lamp replacement reminders. We’ll direct them back to you each year when a new VIQUA lamp is needed. So encourage your customers to register their UV systems – it’s smart business. 

Not all lamps are created equal. 

VIQUA lamps are manufactured with high quality components to exacting speci cations to ensure performance and safety. Using a lamp that was not designed by VIQUA for a VIQUA UV system poses risk. This can include health risk, re risk, reliability risk, equipment failure or damage risk, and loss of system certi cation. Using anything other than a VIQUA lamp is not worth the risk.

While other lamps may seem to t a VIQUA system, its performance or safety simply can’t be guaranteed and your customer will be exposed to the following risks: 

Fire Risk: VIQUA lamps use only non- ammable materials and are engineered to exacting speci cations to ensure safety.

Health Risk: Their water may not be disinfected properly.

Equipment Damage or Failure Risk: Using other lamps in VIQUA systems greatly increases the chances of 
equipment damage, or even complete equipment failure.

Reliability Risk: Their system performance could be compromised and premature power supply failures may occur. 

Loss of Certification: Third-party certi cation (NSF 55 and UL/CE) becomes void. VIQUA systems are safety and performance certi ed as a complete unit which includes a VIQUA lamp.

 We are proud to put the VIQUA brand name on all of our lamps. It’s the guarantee of total UV system performance and safety. If it’s not branded by VIQUA, it’s not a VIQUA lamp. Look for these brands – not part numbers – when choosing a lamp: VIQUA, UVMAX, or Sterilight. 
* PRO series amalgam lamps can operate for up to two years before replacement is required. For seasonal properties, UV lamps can be used for several seasons up to a total life of 9000 hours. 




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