Compact, Cost-effective 4-log Adenovirus UV System

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Posted on October 06, 2016

Operators of small drinking water systems continue to face tough decisions, but how to meet the requirements of the Groundwater Rule (GWR) and the Long Term 2 Enhanced Surface Water Treatment Rule (LT2) for inactivation of viruses needn’t be one of them. With chlorine currently the most common method of achieving adenovirus credits, it no doubt feels like the proverbial rock and a hard place – caught between needing to achieve 4-log viral reduction and the increasing public focus on disinfection-by-products. But there is another solution: using ultraviolet (UV) disinfection.

There are a variety of viruses – including adenovirus, Hepatitis A virus (HAV), rotavirus, and poliovirus - that can be found in water which, if not treated, present a health risk to consumers. Adenovirus stands out and is the regulatory target because it is the most resistant to UV disinfection. In the past, that perceived resistance may have meant that UV was overlooked when designing water treatment systems for churches, camp grounds, restaurants, or schools, for example. But in fact, UV can be a very effective means of disinfection and can achieve the requisite 4-log (99.99%) reduction of adenovirus. The key was providing sufficient UV dose (186 mJ/cm2) and validating its effectiveness. Both are now a given. What’s more, delivering that 186 mJ/cm2 dose is now possible with a compact and cost-effective UV system.

 Introducing the VIQUA PRO24-186 UV system:

  • Fully validated to the UVDGM protocol for 4-log adenovirus reduction.Adenovirus_with_comm_ctre.jpg
  • Features ultra-high output amalgam lamp technology.
  • Incorporates LightWise™ lamp dimming technology.
  • Real-time monitoring and data recording.
  • Multiple validated flow rates (10-24 US gpm).


UV dose is dependent on UV intensity and exposure time. So delivering a dose of 186 mJ/cm2 with some UV systems requires more lamps, a larger chamber, or both, all of which add costs. The VIQUA PRO24-186 uses ultra-high output lamp technology and places two disinfection chambers in series, which provides the entire dose needed for 4-log adenovirus credit in a compact installation.

Who Needs the PRO24-186 UV Water Treatment System?

  •  Any new public water treatment system coming online
  • Ground water systems (GWS) conducting triggered source water monitoring
  • Any ground water system with a significant deficiency requiring corrective action
  • Any water treatment systems looking to reduce chlorination levels

To learn more about the new VIQUA PRO24-186 UV system, including specifications, download the information sheet or contact Anthony Oosterveld in Business Development Management, Projects and Regulated Markets, at


Download  Information  Sheet