Chlorination keeps hot and cold water services free of microorganisms such as bacteria, viruses and microbes. This can be carried out preventatively, if any suspected contamination has occurred, or if a system has not been used for a period of time outside of the recommended usage.

Chlorination of the Whole System

Systems can involve:

  • Water tank disinfection
  • Hot water cylinders 
  • Cold water storage tanks
  • Cooling towers

With new mains pipework installations, your Local Water Authority will want to see a clean set of sample results. They’ll be looking at the total viable count (TVC), free chlorine and turbidity (clarity of water), which our water treatment will address.

If your system has been identified as being contaminated or had any legionella positives, your whole system will may need to be cleaned to ensure that water quality is controlled.

water disinfection

Tailored Water Tank Disinfection

Opal doesn’t offer a ‘one-size-fits-all’ chlorination service. We’ll sample your water so that we fully understand the extent of treatment required. Then we tailor which type of chemicals we use for your tank or cylinder, as sometimes chlorine isn’t the best for purpose. Strengths used also change depending on the system you have and whether it needs to continue running or can be shut down.

System Chlorination Without Shutdown

By dosing the system while maintaining chemical levels within safe drinking water levels, we can clean your system without requiring shutdown, which can be less disruptive to your business.

How Often Should Chlorination Take Place?

Drinking water, makeup and storage water should be tested as a minimum six-monthly. If high counts of bacteria are identified, then chlorination should take place immediately.  Guidance suggests that potable tanks require disinfection annually with cooling towers requiring six monthly disinfection.