IMPORTANT INFORMATION TO CONSIDER
Systems have Minimum Operating Conditions
NSF/ANSI 55 Ultraviolet Microbiological Water Treatment Systems
Point-of-entry and point-of-use systems covered by this Standard are designed to inactivate and/or remove microorganisms, including bacteria, viruses, Cryptosporidium oocysts and Giardia cysts from contaminated water. Systems covered by this Standard are not intended for the treatment of water that has an obvious contamination or intentional source, such as raw sewage, nor are systems intended to convert wastewater to drinking water. The systems are intended to be installed on visually clear water (not colored, cloudy, or turbid).
The NSF 55 Class A Certification requires the system to deliver a 40 mJ/cm² UV dose at the certified flow rate at 70% UVT (Ultraviolet Transmittance). The certified flow rates are determined by NSF through testing protocols. Systems must provide a 4-log reduction (99.99%) of bacteria, virus and protozoan cysts (Giardia lamblia and Cryptosporidium). Class A systems shall be equipped with a UV Sensor to indicate when the UV irradiance at the sensor is below the minimum required by this Standard.
One or more of the following means shall be used to indicate ineffective operation:– a visual alarm;– an audible alarm; or– a system that terminates discharge of water. Water Quality is critical to ensuring proper disinfection and avoiding unecessary nuisanse alarms, boil water advisories and shutdowns. Testing of the water source is important before selecting a NSF 55 Ultra Violet System.
NSF 55 Class A Ultra Violet disinfection systems are widely used for public facilites such as campgrounds, marina's, trailer parks, restaurants and any other regulated facility serving water to the public that is not on a municipal water supply.