Treating a system <40,000 ltr? Get fast ROI with the New DosaFil-Duo® Nano

Closed loop heating and cooling systems of 40,000 litre volume or less, maximum temperatures of 90 degrees and maximum pressures of 10 bar now have the option to benefit from tailor-made DosaFil-Duo® technology. The new DosaFil-Duo® Nano family is perfectly suited to smaller sized systems, providing a cost and operationally efficient solution to water conditioning, combining safe dosing of solid or liquid treatment chemicals with constant side stream filtration and continuous air removal.

The DosaFil-Duo® Nano family comprises:
- DosaFil-Duo® Nano
- DosaFil-Duo® Nano+
- DosaFil-Duo® Nano+PV (Pumped Version)

The family of devices are a “do-it-all” conditioning device for the cleaning, protection and maintenance of closed heating and cooling systems, and enable compliance with BSRIA BG29 & BG50. Each model offers varying system volume, operating pressure and temperature ranges meaning there’s a wider choice to suit customer needs.

The DosaFil-Duo® Nano and DosaFil-Duo® Nano+ are small, compact units and both are wall mounted. Each unit holds up to 40,000 litres system volume, they have a maximum temperature of 90 degrees and a maximum pressure of 10 bar. The additional feature of the DosaFil-Duo® Nano+ is that it comes with smart monitoring built in which instantly notifies user when the filter bags need changing. It also has options for BMS built-in as standard.

The DosaFil-Duo® Nano+PV (Pumped Version) is a backboard mounted device enabling compact installation in tight plant rooms. It has a dedicated recirculation pump with controls to ensure good flow through the device and micro bubble coalescence. The Nano+PV is suited to system volumes up to 10,000 litres with a maximum temperature of 90 degrees and pressure of 10 bar.

Like the rest of the DosaFil® PV range, the DosaFil-Duo® Nano+PV devices come with OEM Grundfos smart pump technology, a 5-year guarantee and round the clock support from the DosaFil technical team. The entire range is manufactured in Britain and each unit proudly displays the official Made In Britain registered collective mark.

10 Reasons you’ll love DosaFil®  

Why is it that most treated closed heating and chilled water systems still fall foul of corrosion, scale, bio-contamination and suspended solids? The answer, according to DosaFil®, is the prevalence of poor or ineffective water treatment practices in the commercial and industrial HVAC industry.

There is nothing more frustrating than a “treated” system that fails due to corrosion, scale or bio-fouling. With DosaFil®, you have a smart device that treats systems – and keeps them treated.

More and more people are turning to the smart, do-it-all device to resolve these issues. From Police Authorities, Schools/Universities, Hospitals, M&E Contractors and more.

There’s plenty of great reasons why people are turning to the DosaFil® device. But here’s our top 10 reasons why you’ll love DosaFil®

  1. Eco-conscious? DosaFil® becomes the UK’s most environmentally-friendly chemical system when used with SolidTek™ sticks.
  2. The only device to combine safe dosing of solid or liquid treatment chemicals with constant side stream filtration and continuous air removal.
  3. Unmatched standard operating pressure and temperature ranges.
  4. Suitable for use with any brand of chemical treatment.
  5. Enables online cleaning of fouled systems.
  6. Fast: isolate, open and change filter bag in under five minutes.
  7. Smart monitoring notifies user when filter bags need changing.
  8. Fully insulated jacket prevents heat loss.
  9. Communication options for BMS built-in as standard.
  10. Manufactured in Britain and comes with a 5 year guarantee.

To see how DosaFil could solve your commercial system conditioning issues, please contact us.


Call: 0345 605 0405



DosaFil® gains re-certification for ISO 9001.2015

DosaFil®, manufacturer of the UK's most environmentally-friendly chemical system, has gained recertification for ISO 9001.2015. First certified in 2018, this is now the third time that the UK-based company, which manufacturers a range of closed system conditioning devices for the HVAC and Industrial Water Treatment market, has been audited and regained the certification.

ISO 9001 is an international standard that specifies requirements for a Quality Management System (known as QMS). DosaFil® is committed to the standard as it enables the company to demonstrate its ability to consistently provide products and services that meet customer and regulatory requirements.

Keen to further the service and effectiveness of its products, DosaFil® is now also working towards ISO 14001 which is the Environmental Management System (known as EMS) accreditation. ISO 14001 helps organisations improve their environmental performance through more efficient use of resources and reduction of waste.

"As a company, we are always looking for ways to enhance our business and improve our environmentally friendly credentials, so that we can pass these benefits on to our clients.

"Our clients value the environment, they value their workforce, and they value their customers - and that's why they choose DosaFil® - they know they can rely on DosaFil® products to care for their customers' systems in the most effective and eco positive way," explained Steve Crick, Managing Director of DosaFil®.

To see how the DosaFil® device could help you, please contact us.

Why magnets aren't helpful in fouled commercial HVAC systems

When it comes to equipment, powerful magnetic devices have become popular as a means of removing ferromagnetic material from system water, something they do very well, no doubt. Contention arises in the fact that much of what comprises suspended solid material in commercial heating systems is not magnetic. Even most types of corrosion products (typically found in heating systems) are not magnetic, such as iron hematite (red iron oxide), copper oxides, and aluminium oxides. The only species of corrosion product (found in heating systems) that is ferromagnetic is iron magnetite (black iron oxide). Furthermore, other types of suspended solids, such as scale, silts, organic materials, microbiological debris and biofilm particles, are not attracted to magnets. In other words, for all non-magnetic suspended solids, powerful magnetic devices are completely redundant.

Consequently, powerful magnetic devices are sometimes paired with a physical filter. This combination of equipment will remove all types of suspended solids, provided the micron size of the filter is appropriate for the system foulants.

What will also remove all types of suspended solids is a physical filter on its own (again, provided the micron size of the filter is appropriate for the system foulants). Put another way, a physical filter will remove iron hematite, iron magnetite, copper oxides, aluminium oxides, scale, silts, organic materials, microbiological debris, and biofilm particles – everything. So why use a product which can only remove one type of suspended solid (a magnetic device), when another product can be used that will remove all suspended solids? It simply doesn’t make sense.

In the presence of a suitable physical filter, magnetic devices are unnecessary. BSRIA guidance agrees: “(magnetic filters) are widely fitted when replacing boilers in domestic heating systems, mainly to protect the new boiler heat exchanger and pump seals from magnetite that has been previously formed in the old boiler and radiators. In principle, magnetic filtration should not be advantageous on a properly maintained system with low suspended solids”[1].

DosaFil conditioning devices do not feature expensive and unnecessary magnets, and are industry-proven to effectively remove all types of foulants from system water. They are easy to use, maintain and install, and are extremely cost effective.

To see how DosaFil could solve your commercial system conditioning issues, please contact us.

[1] BSRIA BG50.2013 page 51.


DosaFil-Duo® conditioning device cleans up police authority HVAC system

A brand new police authority headquarters in the Midlands has had its closed, low temperature hot water system saved from potential failure thanks to DosaFil-Duo®, a unique conditioning device that combines solid or liquid chemical treatment dosing with constant side stream filtration and continuous air removal.  This patented technology is providing an economical and convenient alternative to powerflushing by cleaning and protecting the system online. DosaFil-Duo® was installed after Anker Elemental, a fast-growing water treatment specialist contracted on the site, discovered there were harmful levels of contaminants within the system’s circulating water.

Despite being only recently installed, the hot water system, which controls ambient temperature in the building, contained extremely poor quality water, as Ian Looms, Managing Director at Anker Elemental explained:

“The water’s pH was wrong, it was full of suspended metal solids and so on. In-depth testing revealed that the system had not been cleaned correctly, or possibly at all, while the inhibitor concentration was insufficient. It was also apparent that water treatment had not been maintained in the lengthy period between completion and handover. These conditions are likely to lead to serious problems such as accelerated corrosion, blocking of the system’s control valves, and even complete system failure.”

In the absence of correct system cleaning and flushing, contaminants, such as flux residues, installation debris, and greases and oils from manufacturer components, will remain in system water. Such impurities not only cause corrosion but prevent subsequently dosed inhibitor from working effectively. Furthermore, water treatment - even when applied correctly - must be maintained to ensure lasting protection.

The first step in Anker Elemental’s remediation programme was to clean the system. Traditionally, the company may have chosen powerflushing for this purpose, however, DosaFil-Duo® presented a better solution:

“It is our role, as custom water treatment specialists, to devise programmes that ensure the safe and reliable operation of critical systems while minimising energy, water and maintenance costs for our clients. In this case, powerflushing would have necessitated the opening of every valve on the system, all of which are behind wall panels. This would have been an extremely expensive endeavor and incredibly disruptive, potentially requiring large parts of the building to be shut down, a situation that is far from ideal for a police headquarters where operational continuity is imperative,” said Mr. Looms.

“DosaFil-Duo®, on the other hand, enables commercial and industrial systems that are fouled with corrosion, limescale and harmful deposits to be cleaned up online (filtration is possible to 0.5 microns). By installing DosaFil-Duo®, we eliminated the need for costly and inconvenient offline cleaning, and made it possible to optimise the energy efficiency, performance and longevity of the system, as well as minimise unplanned maintenance and system downtime. DosaFil-Duo® was the obvious choice.”

Once installed on the system – a process which took less than a day as DosaFil-Duo® removes the need for separate bypass chemical feeder, auto air vent and filtration devices – the DosaFil-Duo® was dosed with BSK100, an innovative solid online cleaning chemical product from SolidTek™ Limited.

“We chose to use SolidTek’s solid online cleaning chemical because it is easier for us to introduce the quantities required. Also, solid chemicals dissolve at a steady, constant rate, as opposed to liquid chemicals which are introduced in one go. This ensured even distribution of the cleaning chemical throughout the system and meant that suspended solids were not mobilised too quickly, preventing potential blockages,” clarified Mr. Looms.

The remainder of Anker Elemental’s remediation programme includes bi-monthly visits to the site, where water quality samples are taken for analysis and the filter bags inside DosaFil-Duo® are changed (a process which takes less than five minutes).

DosaFil-Duo® is the only water conditioning device on the market with smart monitoring technology out of the box that automatically notifies users when filter bags require changing (with communication options for BMS built-in as standard). This feature was particularly attractive to the Head of Maintenance at the Police authority, as well as the principal mechanical contractor on the job:

“The filtration alarm provides reassurance to the customer that filter bags are changed as necessary, ensuring active and efficient management of the remediation process. Without such an alarm, the client would have to rely on the filter bags being checked regularly. This approach leaves room for error, or at best wastes labour and resources,” explained Mr. Looms.

Work started over the summer period, when large parts of the system were offline. For the parts of the system that were online, DosaFil-Duo® delivered excellent results:

“We worked down from a 50 micron filter to a 10 micron filter, which shows just how much suspended solids the DosaFil-Duo® picked up,” explained Mr. Looms. “We’ve only had to switch back up to a 25 micron filter since the offline sections of the system were placed online, as this mixed dirty water back in to the cleaner water. However, we’re confident that the system will be clean soon given DosaFil-Duo®’s efficient performance,” he continued.

Results from the water quality samples have also been positive. “We test each sample for variables such as iron content, turbidity, conductivity and so on, and have seen vast improvements in water quality. In addition, we have documented progress for the client, who is pleased to receive visual and data evidence of the cleaning and protection programme.”

Anker Elemental has also since introduced a liquid chemical corrosion inhibitor into the system via the DosaFil-Duo® device. “It is really important for us that we can use solid and liquid chemicals in the system as it gives us more control over the water treatment process, and DosaFil-Duo® is the only device on the market which can do this,” said Mr. Looms.

The Police authority has been so impressed with DosaFil-Duo® that a second device has now been installed in another building, this time on an existing medium pressure hot water system. DosaFil-Duo®’s standard operating pressure and temperature ranges are unmatched in the market, enabling DosaFil-Duo® to be used in a far wider range of systems (such as medium pressure hot water systems) than most other similar devices.

Furthermore, the principal mechanical contractor recommended DosaFil-Duo® to the council, where two further devices have since been installed.

“The contractor and end-user have recognised the value of DosaFil-Duo® as a means of cleaning, protecting and maintaining closed circuit systems in a cost-efficient and convenient manner. As a relatively new British manufacturer in the highly competitive HVAC industry, we are delighted that DosaFil has so quickly established itself as a highly-regarded and exceptionally effective conditioning device,” concluded Steve Crick, Managing Director of DosaFil.

The easiest, most cost-effective way to prevent heating system problems

It is that time of year again when the weather gets colder and heating systems are fired up – possibly for the first time in months. Unfortunately, it’s also that time when many building owners and operators find that their system is not performing as it should.


There are multiple reasons why heating systems lose efficiency or fail; radiator blockages, pump failures, plate heat exchanger failures, small bore pipework becoming blocked, the list goes on. These issues are often caused by stagnation during the summer shut down period.

If a heating system fails, building owners don’t just face the inconvenience and cost of repair and remediation. Failure could lead to more serious consequences such as closure of buildings, relocation of tenants, loss of revenue and significant financial penalties.

What’s the easiest and most cost-effective way to prevent these issues? A system health check from DosaFil, as Chris Harrison, Technical Director DosaFil®, confirms:

“Regular water quality monitoring of closed heating systems is vital to ensure efficient system operation and quick resolution of potential issues.

Our system health check service offers building owners and operators a quick turnaround solution to determine current system water conditions and help identify any potential issues before they can turn into a system failure.”

commercial boiler health check

A winter health check from DosaFil® is quick and simple thanks to our postal water sampling service.

Here’s how it works once you request a health check from us:

This service could save you time and money in the long run by avoiding costly downtime and failures, so if you want to find out more please get in touch: or 0345 605 0405

You won’t believe what happens to mild steel in this experiment. 12-month DosaFil® Online Cleaning Chemical Programme Trial

To ensure that our clients get consistently effective results in the shortest timeframes possible when it comes to water treatment, the team at DosaFil® is committed to the continual testing, evaluation, and evolution of our products. We carry out tests at the aptly named Innovation House, the head office of DosaFil®, and like to share our results.

Our latest test highlights how successful the DosaFil® on-line cleaning chemical programme is in the protection of mild steel. The test used the DosaFil-Duo® device together with our online cleaning chemical program.

After just three months, the system fully protected the mild steel, however it didn’t stop there – a further nine months on (a total of 12 months testing), the DosaFil® system was still producing the same, superior protection. This is a solution that does “exactly what it says on the tin”.

In October 2019, a simple bench test was set up where 0.5” mild steel threaded nipples were immersed in untreated and DosaFil® treated mains water and left for a period of 3 months.

The test samples were:


Bottle 1 - CONTROL – A 0.5” mild steel nipple cleaned with a clean cotton cloth to remove any oil and grease, then placed in a sealed bottle with a silica gel sachet to prevent moisture ingress.

Bottle 2 – UNTREATED – A 0.5” mild steel nipple cleaned with a clean cotton cloth to remove any oil and grease, then placed in a sealed bottle containing 500ml of untreated towns mains water.

Bottle 3 – TREATED – A 0.5” mild steel nipple cleaned with a clean cotton cloth to remove any oil and grease, then placed in a sealed bottle containing 500ml of towns mains water dosed with DosaFil’s® proprietary online cleaning and treatment package consisting of an online dispersant, an online polymer cleaner, a biocide and an inhibitor.

Once the samples were prepared, they were left at room temperature and were only moved when photographed.

The results clearly demonstrate how effective the DosaFil® on-line cleaning chemical programme is at protecting mild steel. The photographs below show the results 12 months after the initial test. The water is still clear with no evidence of corrosion or fouling.

DosaFil® Sources British Suppliers

Made in Britain
Covid-19 has taught us many things. One of them is that the country requires more self-reliance if we are to thrive. And while the corona crisis has been positive for many local retailers and independent traders who have felt an influx of demand from the public, British manufacturing – which is world-leading in so many areas – could still benefit from extra support. And that starts with each of us.

Here at DosaFil®, we’re committed to supporting British industry, skills development, and local economies as much as possible. In fact, since our inception in 2017, we have always aimed to ‘shop local’ for our business and engineering services and product, sourcing all of our suppliers for specialist components, office equipment and engineering services from the Northwest region, and where unavailable, from the UK.

We are proud to support the British manufacturing network and this is one of the main reasons DosaFil® joined Made in Britain in 2017.

Made in Britain is another way that companies can support the industry. It brings together the British manufacturing community, united with the use of the registered collective mark. The mark is protected and can only be used by members of Made in Britain that meet the criteria they set to guarantee the member is a British manufacturer. By joining, members benefit from a licence to use the protected mark and receive their own manufacturer page in the Made in Britain Directory.

Thinking about how you can support British manufacturing?

Steve Crick, Managing Director of DosaFil®, gives five reasons why joining Made in Britain can help:

  1. Members can easily source materials and expertise (wherever possible) in Britain.
  2. The Made in Britain collective mark adds credibility to a manufacturer – for us, this is our DosaFil® range of devices.
  3. Members can network with other British manufacturers within the engineering/construction industry, boosting business.
  4. A company profile on the Made in Britain directory is great for building credibility and trust. It also helps with SEO (Search Engine Optimisation).
  5. Overseas credibility thanks to The Made in Britain collective mark. At DosaFil®, we’ve found that the mark gives overseas buyers reassurance in the quality of the product.

To find out more about Made in Britain:



DosaFil® Limited committed to supporting Armed Forces and their Families

The Defence Employer Recognition Scheme (ERS) encourages employers from both the private and public sectors to support defence and inspire others to do the same. The scheme encompasses bronze, silver and gold awards for employers that pledge, demonstrate or advocate support to the armed forces community, and align their values with the Armed Forces Covenant.

Bronze award holders:

  • are self nominated by employers who pledge to support the armed forces, including existing or prospective employees who are members of the community
  • must have signed the Armed Forces Covenant
  • promote being armed forces-friendly and are open to employing reservists, armed forces veterans (including the wounded, injured and sick), cadet instructors and military spouses/partners

DosaFil® Limited are proud to support our forces and encourage other businesses to do the same. For more information regarding the Armed Forces Covenant and the Defence Employer Recognition Scheme (ERS) go to:


AUE Exhibitor Review from DosaFil®


Aside from having a class-leading product range and superior service capabilities (a given), HVAC manufacturers have to put some skin in the game if they want their products specified in university plant rooms – and this means networking. It’s critical, not only for generating awareness, but also for having those all-important one-to-one consultations with University engineers, who really do value the pursuit of driving high standards.
The Association of University Engineers (AUE) conference, held annually, is the perfect place to network. The AUE is a group of University Engineers who wanted to create a 'networked union of like-minded people'. It has representation from around 100 universities throughout the UK and Eire. The AUE event is a conference that showcases engineering innovations through exhibitor stands and lectures about new techniques and shared experiences.
DosaFil® attended our first AUE conference, this year held at Lancaster University, from the 4th-6th September, exhibiting over three days. We were there to meet University engineers, find out about the issues and opportunities they face, and share the benefits of our patented DosaFil-Duo® range of closed system conditioning devices. The DosaFil-Duo® range enables safe addition of liquid or solid chemicals, continuous side stream filtration from 50 micron down to 0.5 micron, and automatic air removal, so is ideal for commercial HVAC systems. We also used the opportunity to talk about solid on-line cleaning chemicals from SolidTek™, which are designed to be used in combination with the DosaFil-Duo® device.
The team met with a number of engineers at the event, all of whom expressed that they had struggled with traditional water treatment techniques and approaches in the past. Consequently, they were extremely interested in the pioneering capabilities of DosaFil-Duo® to overcome these issues, particularly its ease of operation, smart function, multiple uses (dosing, filtration, and air removal), and convenient and cost-saving online cleaning.
Overall, we found the AUE conference to be extremely beneficial and would recommend it to any manufacturer looking to make valuable connections in the field.
Let us know what you think! Have you attended the AUE? What’s your approach to networking?