Water hygiene services

Chlorination & System Disinfection.

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What is chlorination and system disinfection?

Chlorination and system disinfection is the controlled treatment of a water system to eliminate bacteria and other microbiological contamination. It is used to commission new or altered systems, to remediate systems after a problem, and as a planned control measure, restoring water to a safe and hygienic condition in line with BS 8558 and wider guidance.

Our teams carry out disinfection using appropriate methods and dosing, following recognised procedures and safe systems of work. Every disinfection is documented with certification confirming the process, contact times and post-disinfection sampling, giving you clear evidence that the system has been returned to a compliant standard.

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Why choose Complii?

How we can help.

What is chlorination and system disinfection?

Restored safety

Disinfection eliminates microbiological contamination, returning your system to a clean and hygienic condition.

Recognised methods

Treatment follows BS 8558 and established procedures, carried out under safe systems of work by trained operatives.

Certified process

You receive documentation confirming the method, dosing, contact times and results as evidence of compliance.

Post-works verification

Follow-up sampling confirms the disinfection has been effective before the system is returned to service.

Flexible application

We support commissioning, remedial and planned disinfection across a wide range of system types.

Managed downtime

Works are scheduled to minimise disruption and return your system to normal use as quickly as possible.

You questions answered.

Common triggers include commissioning new or altered systems, remediating a system after a problem such as a positive Legionella result, and planned disinfection as part of a control regime.
We select the appropriate method and dosing for your system, following recognised procedures set out in BS 8558 and related guidance, in accordance with safe systems of work.
The system needs to be taken offline for disinfection and the required contact time. We plan to work to minimise disruption and advise on timings in advance.
Yes. Every disinfection is documented with certification confirming the method, dosing, contact times and results.
Where appropriate, post-disinfection sampling is carried out and analysed through a UKAS-accredited laboratory to confirm the system is safe before it returns to service.

News & insights

News / July 9, 2026

Acquisitions / July 9, 2026

Complii strengthens water compliance offering with acquisition of Sweetbriar Limited

Complii announced the acquisition of Sweetbriar Limited, a specialist provider of water hygiene, water treatment and legionella control services. Based in Chandlers Ford, Hampshire, Sweetbriar brings over two decades of technical expertise and a strong reputation for service-led water compliance to Complii.

Acquisitions / May 22, 2026

News / May 22, 2026

Complii acquires Classic Lifts (Scotland) to grow its lifts and escalators division

Complii, one of the UK’s leading providers of building safety and regulatory compliance services, announced the acquisition of Classic Lifts (Scotland) Limited, a highly regarded specialist lift services provider based in Glasgow. The acquisition represents a significant milestone in Complii’s growth journey, introducing Lifts and Escalators as a dedicated new compliance service line within its expanding portfolio.

Acquisitions / May 15, 2026

News / May 15, 2026

Complii continues Lifts and Escalators expansion with acquisition of The Escalator Company

Complii, one of the UK’s leading providers of building safety and regulatory compliance services, announced the acquisition of The Escalator Company, a specialist in escalator, lift and travelator servicing, maintenance, refurbishment and installation. Based in Rochester, Kent, The Escalator Company brings over two decades of experience and a strong reputation for engineering excellence to Complii.

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Compliance with confidence.

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