Water systems cleans and disinfection

Reduce microbiological fouling and prolong the life of your equipment

Having your system cleaned can help reduce levels of microbiological fouling and also prolong the lifespan of your equipment. The build-up of slime and sludge on the inside and outside of equipment can lead to high levels of microbiological fouling and may lead to legionella proliferation. This slime or sludge is also known as biofilm and the presence of biofilm produces perfect conditions for bacteria to grow and enter your water supply. This often leads to extra water treatment costs as stronger (more expensive) water treatment chemicals may need to be dosed more regularly to keep your systems safe.

The buildup of slime and sludge on your system can also cause extra stress on your system’s operations. This is due to a barrier forming between the system and the water; which can reduce the system’s lifespan and increase operating costs. The buildup of sludge and dirt can also cause blockages, which result in unplanned downtime and repair costs.

Having your system professionally cleaned by our expert disinfection team can provide an extremely cost-effective solution to the problems caused by the buildup of dirt, sludge, and slime.

We have years of experience and expert knowledge in the cleaning and disinfection of a broad range of water systems and can employ a variety of techniques to achieve the best possible results.

  • Reduce levels of microbiological fouling
  • Prolong the lifespan of your systems and equipment
  • Keep operating and treatment costs to a minimum

Why Regular Cleans & Disinfections are important

The cleaning and disinfection of water systems on a regular basis is vital if hygienic conditions are to be maintained. The effectiveness of a water treatment regime such as corrosion inhibitors and biocides, when used in cooling towers, is also strongly influenced by the cleanliness of the system. Our highly experienced technicians carry out these services for our customers throughout the UK.

There are currently two standards that relate directly to this subject:

Legionnaires’ Disease ‘The Control of Legionella Bacteria in Water Systems’ ACOP (L8)

The HSE Code of Practice relates to the control of Legionnaires’ disease and recommends that as part of a complete maintenance and management scheme that regular cleaning and disinfection of the following equipment is carried out:

Cold water storage tanks and down services

Hot water calorifiers

Cooling towers and evaporative condensers

Misting systems

Air humidification plants

Water outlets and showerheads

Water features

British Standard 6700

This standard relates to new, domestic pipework installations and states that new installations or modifications should be disinfected before being placed into service. The method to be used is set out in the standard, detailing the contact times and disinfecting agents to be used. Heating, ventilating and pipework contractors that use our service will have the disinfection certificated on completion of the work and before the building is placed into use.

Frequency of cleaning and disinfection

The frequency of cleaning and disinfection for cooling water systems is described as “If a system can be shown to be free of fouling, i.e. the deposition of particulate material and debris, there is no need for it to be cleaned at a set time interval, rather the system should be cleaned whenever it is known or suspected to have become fouled. However, as cleaning operations are disruptive, it is common to adopt a precautionary approach, with cleaning operations being scheduled to coincide with planned shutdowns or at a predetermined interval, e.g. six monthly” which for the majority of sites would be a predetermined interval such as six monthly.

For hot and cold water systems ACoP L8 says that they should be cleaned and disinfected in the following situations:

(a)  If routine inspection shows it to be necessary

(b)  If the system or part of it has been substantially altered or entered for maintenance purposes in a manner which may lead to contamination; or

(c)  During or following an outbreak or suspected outbreak of legionellosis.

Cooling tower cleaning & disinfection

In general, a thorough clean and disinfection of a cooling tower are best achieved by removal of the cooling tower pack. This approach to the cleaning and disinfection of cooling towers is taken whenever possible by our service technicians.

Where it is not reasonably practicable to remove the pack from the cooling tower, foam cleaning of the pack in-situ can be carried out. We have developed a specialised PackCleanse range of products for this application. Contact us to find out more.

Chemical cleaning and descaling

The build-up of scale in boilers, heat exchangers, cooling towers and pipework reduces the efficiency of heating equipment. Acid washing is the most effective method of removing scale deposits from such systems. If you are using river water within your heat exchanger system you may also require an alkaline cleaner.

Our extensive experience of formulating chemicals allows us to make sure the correct chemical is used for the scale problems you may encounter.


The use of 2pac epoxy paint on water systems is an effective and inexpensive way to protect against corrosion. Using this specialist paint to create a barrier, inhibits the corrosive process but the unique design of the paint keeps the barriers effect on heat transfer to a minimum.

Epoxy paint can be used on new and old systems and can dramatically improve operational efficiency and prolong system lifespans.

Cooling Water Systems

Cooling water systems need to be disinfected regularly as they are generally more exposed to debris and microbiological contaminants that may cause issues within the system, such as corrosion.

The standard method used to clean cooling water systems involves high-velocity flushing of the system followed by a biocide treatment to disinfect it. The cleaning and disinfection of cooling water systems should be carried out on a semi-regular basis to ensure that debris and corrosion don’t reach critical levels.

Pre-commission cleaning

The pre-commission cleaning of hot water heating and chilled systems has grown into an extremely important process over recent years due to the increased susceptibility to blockages of strainers, control valves and small bore heat exchangers.

System contaminants such as scale, jointing compounds and fabricating debris should be removed by chemical cleaning and high-velocity flushing on a regular basis. This will then allow the on-going water treatment regime to work effectively in preventing corrosion and microbiological fouling.


Showers that are used infrequently within your system should be flushed on a regular basis, to remove any stagnant water, in accordance with the HSE’s ACoP L8.

ACoP L8 also recommends the use of chemicals on the hose and shower-head of your showers to stop the environment within your shower becoming favourable for legionella to grow in.

Water system refurbishment

Poor quality water due to the formation of rust, scale, debris and biological deposits make the hygiene of water storage tanks an essential part of a maintenance programme.

Our specialist water tank refurbishment service  can restore existing water storage tanks to HSE and Water Supply (Water Fittings) Regulations 1999 standards.

We offer one of the largest ranges of products, custom engineered systems, chemicals, training and support services available from a single source.

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