Water Treatment and Disinfection


The need to treat and disinfect water occurs frequently, regardless of the source. Water from rivers and lakes can often be contained by untreated discharges of wastewater. It is also possible for sewage to enter such water sources after rain storms. Even water from “clean” water wells can often contain harmful bacteria.

Most drinking water in commercial buildings goes through a disinfection cycle after arriving from the grid. This helps to prevent microbiological contamination from legionella, E.coli and other waterborne pathogens.

In order to properly disinfect water, it is necessary to eliminate 99.999% of all bacteria. Various methods are used to achieve this, each with advantages and disadvantages.

Chlorine is used in the form of either gas, a hypochlorite solution or electrolytically generated hypochlorite.

Chlorine dioxide is the most effective, however it has to be generated on site using chemicals. It has a long-lasting residual effect and is effective at removing biofilm.

UV radiation kills high levels of bacteria but is only effective at the moment the water is passing through the UV chamber. It has no residual effect.

Another way to remove bacteria is via filtration. Although effective, again it has no residual effect once the water has passed through.

A common method used within commercial buildings is pasteurisation. The effect is however very limited, it does not have the ability to remove biofilm and there is no residual.

At Prodose we have experience of working with all of these water treatment methods, and we approach them with chemical engineering knowledge.

We can help you find the best method of disinfection for your specific situation, taking into account variables such as the quality of your incoming water, the length of the system it passes through and the frequency and type of use.

Before you change methods of disinfection, or decide to keep on using the same one, it is worth exploring other options to see if your water processing can be made both safer and more cost-effective.

Our engineers will be pleased to talk to you, assess your current system and advise on how we can help improve it.

Latest Projects

Major UK Stadium Case Study
Major UK Stadium Case Study

Case Study: Stadium water supplyThe dosing of water supplies with chlorine dioxide is a very common and effective method of preventing Legionella within buildings and facilities. Prodose has recently specified and installed a chlorine dioxide generation system in a...

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Bagged Salad Producer
Bagged Salad Producer

A supplier of bagged salads approached us in 2015 to see if we could help them streamline their disinfection process and save costs. The company produces various products for a number of clients. This includes privately labelled items for some well-known supermarkets....

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Electrochlorination is the process of using salt, water and electricity to produce a low pH Sodium Hypochlorite solution directly on site. It is highly efficient because the system can respond to the levels of free chlorine in the water and apply dosing only when required.

Our range of AMPRO electrochlorinators are ideal for many of these applications and come with a full after sales support package. These machines are ideal for small footprint systems and have features such as integral hydrogen degassing, making them safer for installation by third parties.

Our advice is impartial, and we won’t advise a course of action or recommend a piece of equipment unless we know it offers a genuine benefit to your process.

Chlorine Dioxide Generators

Chlorine dioxide is, quite simply, a more powerful oxidising agent than chlorine in every way. It works better as a disinfectant and has the advantage of also breaking down odours.

If you think a Chlorine Dioxide generator might be the best way to go, it is worth getting the benefit of our advice first. We are not on commission and have no interest in selling devices unless they are the most appropriate and effective option for your particular process.

Instrumentation & Control

Instrumentation and controllers are fundamental to our ability to control water treatment processes. It is through the use of reliable and accurate instrumentation that monitors key parameters within the water that we are able to provide information back to the controllers that in turn govern the process.

With a range of single parameter and multi-parameter controllers Prodose are able to supply instrumentation and control systems to meet the most difficult of disinfection control applications.

Our Recent Articles


What is the Electrochlorination Process?

What is the Electrochlorination process? Electrochlorination is the process of applying an electrical current to salt water to produce dilute sodium hypochlorite (bleach) and hydrogen gas. The resultant sodium hypochlorite solution contains between 0.7%-1% chlorine....

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Chlorine Dioxide and Legionella Control

Chlorine Dioxide and Legionella Control Legionella is a bacterium found in soil and water. When it occurs outdoors, it usually does so in low concentrations and doesn’t cause problems. However, when it grows inside artificial water systems, such as hot tubs, hot water...

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Chlorine Dioxide and Water Treatment for Plant Nurseries

Chlorine Dioxide and Water Treatment for Plant Nurseries Horticultural facilities, such as plant nurseries, face many of the same water sanitation issues as their agricultural counterparts. These issues include keeping ornamental and food plants healthy, maintaining...

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