Continuous Disinfection & Chlorine Dioxide

Why do I need a Continuous Disinfection Unit?

All commercial domestic water systems should have a continuous bacterial control regime in place. Traditionally, most systems have used temperature control, hence the need to regularly monitor this aspect. Increasingly however, continuous injection of chemical disinfectants is used as an alternative. This must be completed under approval of The Drinking Water Inspectorate (DWI). The most common chemical disinfectant used for these purposes is Chlorine Dioxide, normally generated at the point of injection by the controlled blending of two chemicals.

There are many benefits of this system which include 24/7 protection and potentially massive energy savings. There are numerous applications that would benefit from this system.

What is Chlorine Dioxide?

Chlorine Dioxide is a safe and potent biocide which is approved for continuous use at levels between 0.1 and 0.5ppm and is effective over a wide pH range in both hard and soft water.

‘The ideal biocide’ — Chlorine Dioxide sounds like just another form of chlorine, but is in fact very different. As a true dissolved gas Chlorine Dioxide is stable and does not react with water. This allows it to ‘travel’ in solution and penetrate micro-organisms by molecular diffusion, thereby attacking bio film at the base of the film, where it is attached, allowing rapid removal.
Model.ImageCaption Februus Chlorine Dioxide Unit

The Sentinel dosing range

4i Water Systems is a highly accredited water treatment company that specialise in Chlorine Dioxide generation and Dosing Systems (CDU). We have developed a robust system that provides proportional dosing to 99.9998% accuracy that can be remotely monitored and controlled from a variety of platforms and can be easily integrated into any BMS systems.


4i Water Services Chlorine Dioxide Units

We have a range of products manufactured by 4i Water Services to offering continuous disinfection through chlorine dioxide.
  • Basic 2020 CDU Automatic Chlorine Dioxide
    The 2020CDU is encased in a chemical resistant glass-reinforced plastic (GRP) case, with all glands and seals being chemical resistant. An additional extractor fan and filter can be added along with leak detection at an additional cost.
  • XT2010 CDU Automatic Chlorine Dioxide Generator
    The XT2010 provides 24/7 data logging, wireless control and monitoring, water leak notification and precision dosing (0.04ml/l of mains water with a max flow rate of 7.2m ᵌ per/h).
  • 2010 Mobile CDU Automatic Chlorine Dioxide Generator
    The 2010 Mobile unit has all the benefits the XT2010 offers, but is completely mobile. This system also has a double probe system to monitor the incoming mains water and the dosed water.
  • 1010 CDU Automatic Single Chemical Dosing
    The 1010 CDU system uses a digital pump that can be linked to a water meter or chemical probe, or just dose off a timer. The tank has a purpose-built chemical resistant level switch to insure the pump does not run dry.

Find out how our water treatment solution experts can help you today