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Disinfection/Chlorinations of water systems

When it comes to water treatments, Richmond Hydrochem Special Projects of Coventry is the name you can count on. 

Disinfection/Chlorinations of water systems

Our trained and competent technicians will attend to safely disinfect your water systems and ensure the highest levels of water hygiene. Our varied disinfection treatments include the use of stabilised silver hydrogen peroxide or microbicide. This will be injected into the source and pulled through to all outlets within the building and left with a minimum contact time to ensure its effectiveness. The chemical is flushed out to make the water safe to use and consume. Once completed a disinfection/chlorination certificate will be issued to the client. Water Samples can be taken post-disinfection and analysed in an UKAS accredited
independent laboratory for validation purposes.


Two types of disinfections include;

1. A mains-fed hot and cold water system, may include water storage tanks and hot water cylinders. The purpose of the disinfection is to make the system safe use and consumption. This can include toilets, taps and showers. Disinfection of water pipes and water storage tanks is essential to ensure safe and clean drinking water.

2. A new external water main installation, when the local water authority requires the main to be disinfected and sampled for connection to the water board. This can include new , modified or contaminated water mains. Each water board will have its own specific requirements regarding disinfection and sample analysis. A water main must be disinfected before pipework is connected to the mains water supply.

What is a disinfection/chlorination certificate?

A disinfection certificate is something we issue after our qualified water treatment engineers have carried out a disinfection of your water system. We use industry approved chemicals to eliminate and prevent bacterial growth from domestic pipework and systems. A disinfection can also be referred to as a chlorination when Sodium Hypochlorite is selected for use.

Why do we carry out disinfections?

We carry out disinfections of water systems to control bacteria and its growth. As water temperatures within a range of 20 °C to 45 °C are favourable for bacteria growth, it is important to ensure that bacteria levels are low. After a new installation, the use of materials can harbour or provide nutrients for bacteria and other organisms. It is particularly important to disinfect fittings where aerosols can develop.

What are the disinfection regulations that we follow?

Our disinfections are carried out in accordance with BS8558 2015 and current legislations HSG274 and ACOP L8. BS8558. The regulations give guidance on chlorination and mains injection for an internal water supply, which applies to the entire hot and cold water systems within buildings. It also offers guidance on external water supplies, providing information about compulsory requirements to flush and disinfect pipework whenever it is modified or newly installed.


BS8558 states that disinfection must be carried out before and as close as possible to the occupation of a building. Furthermore, there is guidance on unused outlets and hygiene flushing regimes. Most importantly it gives guidelines for chemical dosage and method of application, which have been proven and tested to be effective. It also states that the disinfection of a water system needs to be carried out by a trained and competent professional in order to be safe and effective.

Water sampling for laboratory testing

It is recommended that samples are taken in accordance with a site’s water safety plan. You will need to clarify what tests and locations are required. Samples should be taken 2–7 days after disinfection and tested in a UKAS-accredited laboratory.

For all your water treatment requirements, call Richmond Hydrochem Special Projects - We'd be delighted to help you.

Call us now on 024 7666 6482

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