Water System Cleans & Disinfections
Water System Cleans & Disinfections

Water systems cleans and disinfections

technician carrying out chemical clean and descaling


B & V Water Treatment has a dedicated cleaning team, who specialise in the cleaning and disinfection of all water systems. 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 down-time and repair costs. Having your system professionally cleaned by B & V Water Treatment’s expert disinfection team can provide an extremely cost effective solution to the problems caused by the buildup of dirt, sludge and slime.

Our team has 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. The capability list of the B & V cleans and disinfection team is as follows:

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. B & V Water Treatment have several teams of very experienced technicians who carry out these services for our customers throughout the UK.

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

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.

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

legionella on a pertri dishThe HSE Code of Practise 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:

The frequency of cleaning and disinfection for cooling water systems is described as “If a system can be shown to be free of fouling, ie 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, eg 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 is best achieved by removal of the cooling tower pack. This approach to the cleaning and disinfection of cooling towers is taken whenever possible by B & V Water Treatment’s 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. B & V Water Treatment who have developed a specialised PackCleanse range of products for this application.

technician carrying out chemical clean and descaling 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.

epoxy paint examples Paintwork

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.

examples of cooling tower cleans 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 doesn’t reach critical levels.

precommision cleaning of closed systemsPre-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.

cleaning and descaling of a showerShowers

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 showerhead of your showers to stop the environment within your shower becoming favourable for legionella to grow in.


cooling tower system that needs refurbishment 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. B & V Water Treatment have a specialist water tank refurbishment service that can restore existing water storage tanks to HSE and Water Supply (Water Fittings) Regulations 1999 standards.



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