Chlorine Dioxide Generators

At Managed Water Services we install, service and supply Chlorine Dioxide Generators.

The MWS Water Master is an automatic dosing system designed to dose potable and domestic water systems. It is capable of delivering 0.5ppm (or more if required) Chlorine Dioxide residual levels on a wide range of applications. It includes a PLC controlled dosing unit that can be linked to a building management or on site alert system. The unit is pre-packaged and can be retro-fitted to most water systems.

All moving parts of the unit are fully serviceable and no operational restrictions are placed to allow most competent specialist contractors to carry out service if required.

MWS Water Master also has the following safety features built in as standard –

  • Leak detection sensors
  • Flashing beacon and audible alarm
  • Separate control box for mechanical and control devices
  • Flow sensors on delivery pump lines to ensure exact mixture of chemicals is achieved
  • System shut down from external control unit

The MWS Water Master can be retro – fitted to your system or included in new build applications. Full service packages and supply of pre-cursor and activator chemicals are available from Managed Water Services Ltd.

Chlorine Dioxide Generators

What is Chlorine Dioxide?

Chlorine dioxide (ClO2) is a gas with strong Oxidizing properties. An “oxidizing agent” removes electrons from reactive molecules. By this process, ClO2 quickly neutralizes and eliminates odours, acts as a bleach, and also breaks the cell wall of micro-organisms. ClO2’s action is rapid on most micro-organisms and is unique in its ability to kill bacteria, virus, fungus and spores. Chlorine dioxide was first discovered in 1811 by Humphrey Davy. Today, ClO2 is primarily used as a disinfectant for municipal water supplies, especially those with odour and taste problems. It is also extensively used as a bleaching agent in the pulp and paper industry instead of chlorine, since chlorine was found to produce carcinogens. Some newer applications for ClO2 include the disinfection of fruit, vegetables, meat and seafood, the treatment of medical waste, and as a sanitizer in the canning industry and also on small water system.


Chlorine Dioxide is an excellent biocide that is effective in a wide range of water systems and is used widely as disinfection agent. It will not only kill the bacteria on top of the bio-film it will also penetrate the bio-film and help to break it down and kill pathogens that are buried within.

What Makes Chlorine Dioxide Different to Chlorine?

While chlorine dioxide has “chlorine” in its name, its chemistry is radically different from that of chlorine. As we all learned in high school chemistry, we can mix two compounds and create a third that bears little resemblance to its parents. For instance, by mixing two parts of hydrogen gas with one of oxygen – liquid water is the formed. We should not be misled by the fact that chlorine and chlorine dioxide share a word in common. The chemistries of the two compounds are completely different.

Chlorine dioxide is generally accepted to be, more powerful, easier to use, and more environmentally friendly than equivalent chlorine treatments. It is a more expensive treatment, but its superior environmental performance means that it is rapidly replacing chlorine in a number of applications.

What ACOP L8 says:

“It is essential that the system is kept clean because the efficacy of the control method may be reduced substantially in systems that are fouled with organic matter such as slimes or inorganic matter such as scale”

“Levels of 0.5 mg/l can, if properly managed, be effective against planktonic and sessile Legionella in hot water systems”