DCS are specialised in producing effective and efficient cleaning and disinfection of water systems to aid the control of Legionella bacteria.

By being a member of the LCA we comply with regulations to provide a high quality of service for the cleaning and disinfection of any water system.

Where necessary, hot and cold water services should be cleaned, flushed and disinfected in the following situations:

  • slideNew installation or refurbishment of a hot and cold water system
  • Where hot and cold water is not used for a prolonged period and has not been flushed. The time scale depends on the ambient temperature, the condition of the water system and/or the susceptibility outlined in the risk assessment.
  • When, upon inspection of the water tanks, contamination or stagnation is found.
  • Where contamination may have been introduced through alterations.
  • Sample results showing evidence of contamination in the water system.
  • During an outbreak of Legionellosis linked to the water system.

Our disinfection service has proved to be one of the most effective ways to eliminate any harmful bacteria that may be harbouring in a water system. With over 25 years of experience in disinfecting of water systems, tank refurbishment and remedial works, we are able to respond to any problems that may occur and offer a solution promptly. As we are managed under the ISO 9001 we can offer a high standard of service and respond to any emergency disinfection required within 24 hours.

A list of systems, but not limited to, which we disinfect regularly are:

  •  Hot and Cold water systems
  • Mains water services
  • Cooling towers
  • Dry/wet cooling systems
  • Water Softeners
  • Vehicle Wash systems
  • Misting systems
  • Water Features
  • Engineering systems
  • Paint preparation systems
  • Sprinkler systems
  • Emergency showers


There are various methods of cleaning and disinfection for hot and cold water systems:

  • Use of chemical disinfectants such as Sodium Hypochlorite
  • Thermal disinfection, i.e. by heating the water to a temperature at which Legionella cannot survive.

DCS follow the guidelines outlined by the HSG274 Part 2 with regards to the clean and disinfection of hot and cold water systems. We ensure that a service record is kept to show all the work undertaken and also water samples are taken as and when they are required, in which we will respond immediately should any negative results be reported.