If you've been to our online store to look for a UV water filter, you've seen that there are many different options available, with prices ranging from a few hundred dollars to a few thousand dollars. It makes little sense why there is such a huge price range, right? So what is the difference?
To understand the price ranges, we need to understand that UV systems can be separated by their classification, flow rate, and sophistication.
First, a bit about classification. UV units are generally measured as either NSF Class B or NSF Class A. An NSF Class B system will be a less expensive option. These systems are designed to be secondary sterilization/disinfection filters for bacteria control. In other words, a Class B system should be used in conjunction with another means of controlling bacteria. This can include chlorine injection, ozone, or reverse osmosis. Because of this, Class B systems do not measure as high of an UV output/dosage at a given flow rate. An example of a Class B unit would include our UV Dynamics UVD400E Ultraviolet Sterilizer.
In contrast, we have NSF Class A systems. NSF defines a Class A UV system as one that can act as the sole means of sterilization/disinfection for a given water system. Specifically, the UV dosage will be higher at a given flow rate. Class A systems usually include a flow restrictor (to maintain proper UV dosage at a specified flow rate; i.e., 10 GPM) and a clarity sensor (to measure water clarity and to alert when cloudiness/turbidity is restricting full dosage). In Ohio, the Department of Health requires that all UV systems meet NSF Class A guidelines for any system that is used for primary water supply. An example of a Class A unit would include our UV Dynamics UVD600 UV Sterilizer.
Along with classification, each UV system will have a flow rate assigned to it. You'll want to match the UV system with your pump capabilities. Most residential applications will not need a system greater than 10 gallons per minute (GPM).
Finally, there are various levels of sophistication for UV systems. Our UV Dynamics line includes systems ranging from whole-house/cabin units to large home and commercial-grade sterilizers. Each UV system includes the major components you'd expect: a lamp, a quartz sleeve (encases the lamp and protects it from moisture), a stainless steel chamber, and a ballast with control box. To ensure full penetration of UV light into the water supply, the quartz sleeve should be cleaned regularly — especially if your water supply has high turbidity or low clarity. Replacement lamps and quartz sleeves for all UV Dynamics models are available in our store.
So which system do we recommend? It depends on the application. If you are installing a residential rainwater collection system and you want to use UV as the sole means of sterilization, we almost always recommend the UV Dynamics UVD400E Ultraviolet Sterilizer. This unit is well-suited for whole-house and cabin applications and performs reliably as a primary sterilization solution.
As always, thanks for reading!
