Water treatment is vital to maintaining the efficiency, reliability, and hygiene of closed heating and cooling systems. BSRIA BG50 (2021) provides detailed guidance on best practices for treating and maintaining these systems, helping facilities managers and building operators protect assets, prevent failures, and comply with industry standards.
At Marlowe Environmental Services, we work with organisations to implement BG50 principles effectively. Our water hygiene specialists help clients design and manage closed-system water treatment programmes that reduce risk, enhance performance, and extend system lifespan.
BSRIA BG50:2021 is the latest edition of the Building Services Research and Information Association’s definitive guide to water treatment in closed-circuit HVAC systems. It supersedes the 2013 version and reflects the latest advances in monitoring technology, corrosion prevention, and maintenance best practices.
The guidance is designed for facilities managers, design engineers, installation contractors, and maintenance teams, offering clear, practical advice on maintaining water quality and system performance.
Key topics covered within BSRIA BG50 include:
Following BG50 helps ensure compliance with the Health & Safety at Work Act 1974, COSHH Regulations, and Workplace (Health, Safety and Welfare) Regulations 1992.
BG50i is our Water Treatment’s intelligent maintenance and real-time monitoring package, designed to help responsible parties meet the requirements of BSRIA’s BG 50/2021.
For more information, download our guide.
Effective water treatment protects critical building services by preventing corrosion, scale, and microbiological fouling. Non-compliance with BSRIA BG50 can lead to system degradation, breakdowns, and increased operational costs.
Following the BG50 guidance demonstrates a proactive commitment to safety, efficiency, and environmental responsibility.
BSRIA BG50 is the UK’s best-practice guide for water treatment in closed heating and cooling systems. It sets out procedures for maintaining water quality, preventing corrosion, and ensuring long-term system reliability.
BG50 applies to facilities managers, building owners, engineers, and maintenance contractors responsible for managing closed heating and cooling systems.
Following BG50 helps prevent corrosion, microbiological fouling, and scaling, ensuring systems operate efficiently and safely while meeting regulatory expectations.
It complements BSRIA BG29, which covers pre-commission cleaning, by focusing on ongoing system treatment and maintenance after installation.
We deliver tailored water treatment and real-time monitoring solutions designed to align with BG50. Our specialists help clients assess system health, manage risk, and maintain compliance.
While not legislation itself, BSRIA BG50 supports compliance with statutory duties under the Health & Safety at Work Act, COSHH, and Workplace Regulations.
