Cooling water systems chemicals

Understanding your system requirements

Cooling water systems are designed to remove heat from water used within an industrial process. Cooling via water is still seen as the most effective and low cost way to remove heat from a process, making cooling water systems a common aspect of industrial premises. Cooling water systems are also often found in the majority of modern offices due to the requirement for air conditioning systems. As cooling water systems are becoming more commonplace within industry, it is vital that the risk management and maintenance needs of these systems are monitored. At SUEZ we have over 35 years’ experience in dealing with various cooling water systems and all aspects of the required water treatment and maintenance needs.

•   Solve microbiological problems with proven biocides

•   Inhibit scale and corrosion

•   Automatically and precisely treat systems with dosing solutions

Scale and corrosion inhibitors

Scale is caused by the formation of insoluble calcium and magnesium salts, and appears as a rock-like coating. If scale is allowed to form in heat exchangers and cooling tower packing, it will lead to a reduction in heat transfer and cooling capacity, as well as acting as a breeding ground for bacteria. We have a fantastic range of scale and corrosion inhibitors specifically designed to work within cooling water systems. Our range considers the large variety of systems comprised of a variety of materials available to ensure that no matter what the design of your cooling water system we have a scale and corrosion inhibitor for you. The range of scale inhibitors for use within cooling systems are made from both organic and inorganic materials which are excellent at inhibiting scale on your system’s surfaces. To talk to one of our Water Treatment Specialists about scale and corrosion inhibitors or to arrange a visit contact us today. 

Oxidising biocides

The water within a cooling system provides optimal growth conditions for many species of bacteria, including Legionella spp. The warm environment and high levels of organic debris make for a particularly pleasant environment for rapid bacterial growth if this is left uncontrolled. Biofilm build up within a system will greatly inhibit the heat transfer efficiency of the system as well as blocking pipe-work. A build-up of biofilm within a system will also encourage the growth of Legionella bacteria and may promote the formation of under deposit corrosion. Oxidising biocides simply oxidise microbial cells and will kill most micro-organisms including bacteria, algae, fungi and yeasts. The main oxidising biocides used in the UK for the control of microbial growth in cooling towers are chlorine and bromine based. Our range of oxidising biocides are specifically designed for use in the chemical cleaning of cooling water systems. These chemicals are proven solutions to microbiological problems found in cooling water systems and can be used as a biocide in all aspects of your cooling water system.


Non-oxidising biocides

Non-oxidising biocides kill microorganisms typically by disrupting the organism’s metabolism or damaging the cell wall. Many water treatment companies will use a programme of both oxidising and non-oxidising biocides in order to efficiently control microbial populations within the system. In most cases, the oxidising biocide is used to control the influx of micro-organisms entering the system and the continual low level present acts as a biostat within the system. A non-oxidising biocide is then used as a periodic shock dose to the system. If no oxidising biocide treatment is used within a system then alternating non-oxidising biocides can be used to control microbial populations.


When selecting an appropriate non–oxidising biocide it is important to consider the following:

•   Retention time of the system

•   Any microbial flora present

•   Efficacy of the non-oxidising biocide in controlling these

•   Biocide application rates and frequency of dosing

•   Requirement for a bio-dispersant within the system

•   Cooling system pH

•   Compatibility of the proposed biocide with other treatment chemicals within the system

•   For technical advice on the correct selection of a biocide treatment programme please contact the Technical department.

Anti-foams and cooling water dispersants

Our cooling water system antifoams have been specifically developed to combat the problems caused by foaming in this type of system. On occasion it is necessary to dose supplementary biodispersant into a cooling system. This may be as part of an on-going treatment programme or a biodispersant may be required when cleaning out a badly fouled system. Care is required when dosing these chemicals as excessive dosing and agitation within the system can give rise to the production of foam. There are also a number of formulations available for the dispersion of oil contamination within these systems. To talk to one of our Water Treatment Specialists or to arrange a visit contact us now using the button at the bottom of the page. 

PackCleanse range

The SUEZ PackCleanse cleaning system effectively cleans light to moderately fouled packs by combining the disinfecting power of chlorine dioxide with the cleaning power of a weakly acidic surfactant mixture. The system produces a high-cling foam which is applied to surfaces to be cleaned under low pressure. Ideally, cooling tower pack should be removed for cleaning and inspection. In some cases, if pack removal is not possible from a health and safety or access point of view, the pack can be cleaned in place using the PackCleanse range of chemicals. It is essential to consult HSG 274 part 1: “The control of legionella bacteria in evaporative cooling systems”, to ensure that the correct level of pre and post inspection and monitoring is carried out to ensure such a clean has been carried out successfully.

Dosing of cooling water chemicals

Cooling water chemicals are ideally dosed automatically via a precise chemical pump which is controlled by equipment which will ensure the correct amount of chemical for the application. There are several methods of achieving this. The two most popular methods are to either link the pump to a water meter or to the operation feed pump so that the dosing is proportional to the evaporation load of the system. The most appropriate and precise method will depend upon the site conditions. A member of our Water Treatment technical support team can give you further advice on which method is most appropriate.

what our customers say:

I always get a fast response to any enquiries – something I haven’t found in many other suppliers. Their range of chemicals is brilliant, and the technical support sets SUEZ (B & V Group) apart from other companies

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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