Effective water chlorination and sterilisation services are essential for maintaining clean, safe, and compliant water systems. Whether you operate commercial, industrial, or residential premises, ensuring your water supply remains free from harmful microbes and pathogens protects public health and supports overall water hygiene.
By using carefully controlled disinfection methods such as sodium hypochlorite, calcium hypochlorite, and chlorine gas, the treatment process eliminates bacteria and biofilm from pipework and storage tanks. Regular chlorination helps maintain a healthy balance of free chlorine and combined chlorine, securing consistent water quality across all systems and preventing contamination throughout the distribution network.
Why Water Chlorination & Sterilisation is Necessary?
Chlorination and sterilisation play a vital role in water treatment by eradicating pathogens present in raw water or neglected systems. These disinfection methods reduce risks associated with chronic exposure to bacteria and other microorganisms, making water safe to drink and use. When you add chlorine to a water supply, it reacts with organic matter, forming hypochlorous acid and hypochlorite ions that destroy harmful microbes.
Without proper maintenance, systems can develop scale, odour problems, or biofilm, compromising hygiene and safety. Consistent treatment ensures compliance, stability of chlorine concentration, and reliability for drinking water and general use across all environments.
Water Purification
for Better Water Quality
Getting clean and fresh supply means working hard for it. A team of people will use a lot of chemicals to achieve it. Chlorine is among the most powerful, yet safest compound that we use to delive perfect results. Of course, only true professionals know how to do it, because timing and amounts are everything.
Chlorine comes in different shapes and forms. Sometimes we don’t use liquids but the chlorine chemicals come in tablet form. They produce the same filtration and purification that battles ammonia and the tiny particles that affect the quality. After this, there’s no chloramine left behind that will harm anything living in it, including fish.
Clean Water Hygiene
of Drinking Water
Clean drinking water should never be taken for granted. It’s the result of careful work — chlorination that kills microbes, clears out contamination from storage tanks and filters, and keeps tap water safe for everyone. We use chlorine gas or calcium hypochlorite to disinfect without leaving behind strong tastes or odours.
Every treatment allows just the right contact time to do its job — no more, no less. By stopping toxic disinfection by products from forming, the water stays clear and fresh. The goal is simple but vital: clean water that protects health and meets every safety standard.
Better Performing Water Supply and Water Systems
A well-maintained water system doesn’t just deliver water — it keeps it moving smoothly and safely. Chlorination helps make that happen. It reduces bacteria, keeps biofilm from clinging to pipe work, and slows the corrosion that wears systems down. Over time, even small deposits can block flow or cause pressure drops, so regular disinfection matters.
Using breakpoint chlorination, once the chlorine demand is satisfied, a steady residual remains to guard against new pathogens. The result is dependable water, cleaner storage tanks, fewer odour problems, and a system that performs better and lasts longer.
Our Chlorination & Sterilisation Services Include:
Pre-treatment site inspection and planning
Flushing and cleaning of pipework, tanks, and outlets
Application of disinfectant to controlled dosing levels
Contact-time monitoring to ensure full system sterilisation
System flushing post-treatment to remove residual chemical
Microbiological sampling and laboratory testing (where required)
Certification of chlorination for compliance records
Our comprehensive chlorination and sterilisation services are carried out with precision and care to meet all safety regulations. From initial inspection to certification, every stage is designed to guarantee consistent results and verified hygiene standards. Our specialists use the appropriate disinfection solution, control chlorine concentration, and maintain optimal contact time to ensure full sterilisation of your water systems.
We manage both small and large amounts of water with equal attention, providing professional chlorination for new, existing, or modified systems. Following treatment, we verify cleanliness through sampling and provide a chlorination certificate as proof of compliance.
When Chlorine Disinfection and Sterilisation is Required?
Chlorine disinfection and sterilisation are required whenever the integrity of a water system is compromised or newly established. This includes commissioning new water systems, after plumbing works, or when systems experience stagnation, contamination, or high turbidity. It is also necessary following failed microbiological testing or when bacteria and biofilm are detected in storage tanks or distribution systems.
By adding chlorine or sodium hypochlorite, operators can rapidly disinfect and restore clean water supply, meeting health and safety obligations. Proper contact time and monitoring of chlorine residual levels ensure that all pathogens present are neutralised effectively before use or re-occupation.
Installing or commissioning new water systems
Reinstating systems after shutdown or stagnation
After plumbing repairs, alterations, or contamination
Following a failed microbiological test
When high levels of scale or biofilm are identified
Before occupancy in newly built or refurbished premises
What Our Customers Say
“The team at Comfort Services Group were awesome when they carried out the Legionella Control works at our offices, they were very accommodating, Tom and the guys on site were a pleasure to work with. I would recommend the services of Comfort Services Group without reservation. Excellent First impressions with the Office Team, which was mirrored by the guys who did the work. Thanks guys.”
Michael Green
“I have had Comfort commissioning working on different projects for the companies i have worked for over the past 15 years. They have assisted in many difficult projects throughout the country. Andy and Lawrence have been very professional and helpful. i found their attitude, and pro-active approach to be of very high standard. i will always push to use them on future projects”
Chris Richards
“Comfort commissioning are a great company, they deliver great services and the team there are very helpful and efficient. They really do care about their customers and take a keen interest in ensuring a high level of customer service is maintained at all times.”
Gary Clatworthy
“Fantastic service from Comfort from start to finish. Very responsive, friendly, reliable and professional.”
Sarah
“Contacted Comfort Commissioning Services Ltd for advice about unusual deposits in the header tank of an open vented domestic heating system. Not core business for them, but one of their directors responded to me really quickly via email with some excellent free advice which was greatly appreciated. Very impressed.”
Pete Davies
Certified Chlorination with Proof of Compliance
Certified chlorination provides reassurance that your systems meet the latest British Standards for water hygiene. Each treatment is fully documented with detailed reporting of chlorine concentration, contact time, and the disinfection methods used. Our technicians ensure safe management of chemicals such as chlorine gas or liquid hypochlorite, keeping exposure within regulated limits.
Once the water treatment process is completed, microbiological sampling confirms effectiveness before issuing the chlorination certificate. This traceable record supports compliance with legal and industry requirements, demonstrating that the treated water is safe to drink, free from harmful microbes, and suitable for immediate use.
Why Choose Us for Your Water Chlorination Needs?
Experienced water treatment and hygiene specialists
Fully compliant procedures aligned with industry standards
Fast response and minimal disruption to building operations
Laboratory analysis available for verification tests
Clear documentation for full compliance traceability
We bring extensive experience in chlorination, sterilisation, and water purification across all types of systems. Our qualified water hygiene experts use safe, compliant, and proven disinfection methods tailored to each site’s needs.
We focus on achieving the correct chlorine demand and maintaining free chlorine levels for effective results.
From initial planning to post-treatment analysis, we deliver professional service with minimal disruption to building operations. Every chlorinated water system is supported with a compliance report, verification testing, and clear documentation, ensuring your site remains safe, efficient, and fully aligned with water quality regulations and public health standards.
Chlorination of Water
is Suitable For:
Commercial and office buildings
Schools, colleges, and universities
Hotels, leisure centres, and hospitality venues
Healthcare and care environments
Residential developments and rental properties
Industrial and manufacturing facilities
Chlorination and sterilisation are suitable for a wide range of water systems, from commercial and industrial to residential properties. It is particularly beneficial for facilities with high usage, such as schools, hospitals, hotels, and care environments where clean water and hygiene are essential. By applying controlled chlorine concentration and monitoring residual levels, our treatments ensure safe operation across all water networks.
Each system, regardless of size or design, receives a tailored treatment process that eliminates risks and prevents contamination.
This guarantees a reliable supply of clean water for drinking, washing, and day-to-day operations within your premises.
British Standards Regarding Water Chlorination
British Standards like BS EN 806 and BS 8558 aren’t just paperwork — they’re what keep your water safe to drink. They tell us how to use chlorine gas or calcium hypochlorite properly, how long the contact time should be, and how every sample must be tested before it reaches you.
When these rules are followed, bacteria in raw water or storage tanks never make it near your tap water. It’s all about trust in the system — no strange odours, no harsh reactions with other chemicals, just clean, reliable water that meets the standards every home and building deserves.
Start with a Safe
& Clean Water System
Clean water doesn’t happen by luck — it’s made. Behind every glass of tap water there’s a team making sure it’s safe to drink. We use chlorine gas or calcium hypochlorite to reach deep into the system, through the tanks, the pipes, the corners no one ever sees.
Sometimes access is tight, sometimes it’s messy, but that’s the work. The water’s flushed, tested, treated again if needed — until it runs clear and fresh. No strange odours, no residue, no trace of other chemicals left behind. Just clean water, the way it should be — ready when you are.
Get a FREE consultation
We will process your data in accordance with our Privacy Policy.
You can opt out of these communications at any time by updating your preferences.
Frequently Asked Questions
How to manage chlorination and sterilisation?
You don’t just pour chlorine in and hope for the best. Managing chlorination and sterilisation is about control — knowing how the water behaves, how long the contact time should be, how the chlorine residual changes as it moves through the system. It’s maintenance, testing, patience. A good operator keeps the balance steady, records the results, and treats the water as something alive — changing, reacting. That’s how clean water stays clean. That’s how you keep people safe.
What is the difference between water sterilisation and water disinfection?
The difference sits in the details. Disinfection kills most pathogens present — bacteria, viruses, things that make water unsafe to drink. Sterilisation goes further; it wipes the slate clean, leaving nothing living behind. Chlorination is a form of disinfection using sodium hypochlorite, chlorine gas, or hypochlorite ions. Sterilisation is more absolute — often used in hospitals or labs, where water purity must be total. For most systems, disinfection does the job beautifully, keeping your supply safe and stable without overkill.
How long does a water chlorination treatment take?
There’s no single clock for it. Some systems are done in a few hours; others stretch into the night. It depends on water volume, the condition of the pipework, and the chlorine demand. You add chlorine, watch the reaction, wait for the contact time to pass — maybe six hours, maybe twelve. You test again until the chlorine residual sits exactly where it should. Only then does it feel right. Only then do you know the water’s safe to flow again.
Will building operations need to stop during chlorination?
Not always. It depends on how your water system is set up. The treated areas have to be isolated — that’s non-negotiable — but life can usually carry on around it. We often work out of hours or over weekends, keeping disruption low. Chlorine concentration is carefully managed to avoid exposure risks, and once the system’s flushed, you’re good to go. It’s more of a pause than a shutdown — a quick breath before the system runs clean again.
How soon can we use the water after chlorination?
Very soon — usually just a few hours after flushing. Once the chlorine residual levels drop to safe limits and the samples come back clear, the system can be used straight away. The goal isn’t just clean water; it’s water that feels and tastes right, with no trace of chlorine’s bite. By the time we hand it back, it’s ready — safe for drinking, washing, even food processing. Fresh, compliant, and alive with that clean-water confidence everyone deserves.
