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Safe drinking water and process water, secondary disinfection, purification of water

Drinking water quality is something we take for granted in the UK but it is still the preoccupation of Water Safety Group team members, microbiologists, site facility managers and water hygiene technicians because we now understand the greatest risk to human health is from waterborne pathogens, viruses and infections largely between water entering our building and the building water distribution system in it, as well as the last few metres before point of delivery (taps, showers etc).

Choosing the right water disinfection method or multiple technologies used together, is vital in order to appropriately protect patients, your workforce and building visitors. In addition, site operators and managers are required to:


This is especially relevant for but not limited to:


Food & Beverage

  • Disinfection of product and process water
  • Bottle cleaning, rinsing and pasteurisers
  • Disinfection in CIP (cleaning in place systems)
  • Water vapour treatment in dairies
  • Fruit, vegetable, seafood, fish, poultry processing
  • Breadcoolers
  • Water Reclaim and Re-use


  • Cooling water treatment
  • Legionella control
  • Disinfection in process water
  • Removal of odorous substances in air scrubbers
  • Slime control in the paper industry
  • Secondary disinfection of potable / process water
  • Effluent Remediation
  • Water Reclaim and Re-use

Water companies

  • Disinfection of potable water
  • Disinfection of wastewater

Alternative to mains water

  • Borehole
  • River

Hospitals, hotels, care homes, sports centres etc

  • Legionella and microbes (Pseudo, MRSA etc) protection in cold / hot water systems
  • Secondary disinfection of potable water
  • Disinfection in cooling towers and air conditioning systems
  • High risk (hydro-pools etc)

Market Gardening

  • Disinfection of irrigation water in plant cultivation
  • Pig / Poultry feed water for livestock

Swimming pools

  • Regular disinfection of filters
  • Combatting Legionella (showers etc)
  • Regular disinfection of pool water


Water safety, purification of water, secondary disinfection eBook

  • Adherence to Drinking Water Regulations.
  • Compliance with ACoP L8.
  • Meet WRAS and WHO guidelines for safe drinking water quality.
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Water safety, purification of water, secondary disinfection eBook cover



The two principles of disinfection

There are two principals of disinfection: primary disinfection achieves the desired level of mircroorganism kill or inactivation, while secondary disinfection provides enhanced protection by preventing the regrowth of microorganisms harmful to human health between incoming public water supply to your building and the water distribution system inside your building right up to point of use – tap, shower etc. 


Choosing the optimal solution

Deciding which technology or generation system is right for you hinges on your objective, application, water usage, flowrates, preference and tolerance of generation method as well as other criteria. 

Selecting between some of the most common technologies such as traditional Sodium Hypochlorite, Chlorination and Hypochlorous Acid Generation, Chlorine Dioxide Generation, Ozonation, Ulraviolet Light (UV), Ultralox40®... requires specialist advice and in all likelihood a combination of technologies may be more suited tailored entirely to your site / building / water distribution system.

The eBook (free download) is an introductory reference tool that helps you compare some of the most common disinfection techniques:

Traditional Sodium Hypochlorite

Sodium Hypochlorite (NaOCI) is one of the most commonly used compounds for water purification, especially across large scale surface purification, bleaching, odour removal and water disinfection in cooling towers for example.

Chlorination (Hypochlorous Acid Generation)

The GENOX generator produces a colourless liquid which is generated on-site, on-demand without buying, mixing or handling toxic chemicals. Direct electrolysis of brine, creates an oxidant NEUTHOX® on demand.

Chlorine Dioxide (new style Catalytic Generation) or ClO2IX

A universally effective primary and secondary disinfectant without the usual limitations of chemical mixing, handling or storage.

Chlorine Dioxide – WRAS Approved Pureox 3500

A universally effective primary and secondary disinfectant, generated using a patented Safe Generation per Batch (SGB) technology.


Ozonation is a water treatment process that destroys microorganisms and degrades organic pollutants through the infusion of ozone, a gas produced by subjecting oxygen molecules to high electrical voltage.

Ultraviolet Light (UV)

Ultraviolet (UV) radiation is generated by a special lamp. When it penetrates the cell wall of an organism, the cell’s genetic material is disrupted and the cell is unable to reproduce.


A Regulated, stable, highly effective low concentration form of chlorine and particularly efficacious fast-acting biocide.


To learn more about each and advantages, limitations, process, equipment, chemicals and usage guidelines, download the eBook.


Complete systems for EVERY requirement.