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maintaining appropriate fl ow speeds. These measures not only improve effi ciency but also reduce the risk of stagnation and bacterial growth.


Commissioning is critical


One of the most overlooked aspects of water treatment is the commissioning phase. Before a system is brought into operation, it must be thoroughly cleaned, fl ushed, and, where necessary, disinfected. Failure to remove installation debris or


contaminants can compromise system performance from the outset. Similarly, fi ring equipment before verifying water quality can result in immediate scale formation or damage, potentially invalidating appliance warranties. Sampling and analysis during commissioning


provide assurance that water quality meets the required standards. Documentation, including water quality certifi cates and commissioning records, should be retained as part of a comprehensive water treatment log.


Ongoing maintenance and monitoring


Water treatment is not a one-time activity but an ongoing process. System conditions change over time due to variations in water supply, operational


patterns and equipment wear. Regular monitoring is therefore essential to ensure that treatment measures remain eff ective. This may include periodic sampling, inspection of heat transfer surfaces and performance checks such as temperature diff erentials or fl ow rates. Maintenance requirements will vary depending


on system type. Storage systems, for example, may require inspection of internal surfaces and sacrifi cial anodes, while instantaneous systems rely more on performance indicators to detect scale build-up. Where treatment equipment is installed, it must also be maintained in accordance with the manufacturer’s recommendations. Neglecting this aspect can render the treatment ineff ective and allow problems to develop unnoticed.


Health and safety considerations


As well as performance and effi ciency, water treatment plays a vital role in safeguarding health. Biofouling, including the risk of Legionella, is a critical concern in commercial hot water systems. Compliance with health and safety legislation, including guidance such as HSG274, requires the implementation of appropriate monitoring and control measures. This may involve temperature management, regular disinfection, and risk assessments conducted by competent personnel.


Trade Matters with


Responsibility ultimately lies with the duty holder, who must ensure that risks are identifi ed, managed and documented. Competence is key; those involved in water treatment must have the necessary training and understanding to carry out their roles eff ectively.


A holistic approach


Eff ective water treatment is not simply about installing equipment; it requires a holistic approach encompassing analysis, design, commissioning and ongoing management. Each stage is interconnected, and failure at any point can undermine the entire system. For building owners and operators, the message is


clear: invest time and expertise upfront to understand water quality and implement appropriate treatment strategies. The benefi ts – including improved effi ciency, reduced maintenance costs and enhanced system reliability – far outweigh the initial eff ort. In an environment where energy effi ciency and asset


performance are under increasing scrutiny, getting water treatment right is no longer optional. It is a fundamental component of good engineering practice and a cornerstone of sustainable building operation. The ICOM guide ‘Water Quality Considerations of Domestic Hot Water Systems for Commercial Applications’ can be downloaded from the ICOM website www.icom.org.uk


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