This is what makes Pure Decontamination different

Pure Decon is guided by the advice and recommendations from the UK government including expert bodies within Public Health England and our commitment to the best possible hygiene standards means we have invested in the world’s most advanced and effective decontamination technology.

In today’s post we will guide you through the main decontamination methods used throughout the industry. We will then compare these methods to our decontamination processes.

Each of the technologies covered are discussed in the following format:

• A description of the technology
• An explanation of how the technology works with consideration given to available evidence
• An overview of the limitations of the technology

The technologies which are covered include:

Hydrogen peroxide vapour (HPV) fumigation (also known as iHP)
Electrostatic Disinfection sprayers
Fogging
Pump Sprayers

General points for consideration

Training: any cleaning technology will only work effectively if it is used in the correct way by a staff member who is trained and competent.

Evidence: there should be robust evidence of its effectiveness at destroying or removing pathogens.

What is Hydrogen peroxide vapour (HPV) fumigation?

In this process, a microbicidal liquid, hydrogen peroxide, is turned into a gas in a sealed hospital room. Hydrogen peroxide vapour (HPV) technology has been developed for use in healthcare settings. The most common use is for terminal cleans of single rooms and bays.

How does it work?

HPV works by the vaporisation of liquid hydrogen peroxide under flash heating to produce a gas. This gas quickly reaches a concentration of around 0.2 mg/L, which is sufficient to kill the pathogens with which it comes into contact. The vapour will not penetrate into areas of organic soiling or through fabrics. It will only have limited penetration into stacked items and through closed doors and drawers. The process is more effective on non-porous materials. The required cycle time will vary according to the exact concentration of gas produced, the size of the room and its layout and contents. The gas is toxic, and rooms must be vacated and sealed during the process. Following the decontamination cycle, the unit catalytically decomposes residual vapour into oxygen and water.

What are the disadvantages of Hydrogen peroxide vapour (HPV) fumigation?

  • The gas produced is toxic, and therefore great care must be taken to completely seal any room in which the process is to be used, including any ventilation grilles and smoke alarms.
  • The process does not have any cleaning effect and the vapour will not penetrate through organic soiling. Therefore, thorough cleaning must be performed beforehand.
  • HPV is Corrosive and uses at least 30-35% hydrogen peroxide.
  • Entire process can take up to (8 hours) from start to finish.
  • Dangerous vapor – accidental exposure to vapor can cause worker injury.
  • Fire hazard – all cellulose materials must be removed from room.
  • HPV is less effective on soft furnishings and carpeted areas.
  • Electrostatic Sprayers.

What is Electrostatic spraying?

Electrostatic spray surface cleaning is the process of spraying an electrostatically charged mist onto surfaces and objects. Electrostatic spray uses a specialized solution that is combined with air and atomized by an electrode inside the sprayer. Subsequently, the spray contains positively charged particles that are able to aggressively adhere to surfaces and objects. Because the particles in the spray are positively charged, they cling to and coat any surface they’re aimed at.

How does it work?

Electrostatic spraying of paints has been around since the 1940s and is the preferred method for the effective coating of metal surfaces including railings, gates, banisters, metal doors, industrial equipment, fencing, and pipes.

Extremely low power versions of this technology have also been applied to equipment dedicated to disinfecting applications. When tasked with higher levels of productivity and larger disinfecting jobs, it is not uncommon for maintenance staff to look to electrostatic disinfectant equipment.

In theory, these solutions provide a negative charge to the disinfecting solution as it exits the spray nozzle. The charged particles are attracted to a grounded surface (or a surface with a neutral electrical condition), providing a “wrap” effect around all sides of the surface.

What are the disadvantages of Electrostatic sprayers?

Electrostatic spraying has typically been used in a controlled environment, such as a paint spray booth. This controlled environment, with minimal air movement and proper grounding of the sprayer and the surface being sprayed can result in high transfer efficiency of the material and wrapping effect onto the grounded object. Without adequate environmental and grounding controls, natural attraction of electrons and neutrons will be negatively impacted – resulting in a lower transfer efficiency and limited wrap effect.

In addition to inadequate grounding, the wrap effect provided by electrostatic sprayers can vary greatly depending on the actual charge and the type of surface, wind and the distance away from the surface sprayed. Many electrostatic disinfectant sprayers provide a limited charge, comparable to less than 2% of the power of an industrial electrostatic sprayer found in painting applications. This significantly lower power level, minimal charging and inadequate grounding can result in incomplete and inconsistent surface coating – making it challenging to meet required chemical dwell times across the surface being treated.

  • Electrostatic Disinfection sprayers do not completely coat surfaces and they also allow for surfaces to dry too quickly meaning they do not achieve required chemical dwell times
  • Electrostatic Disinfection sprayers require additional time and labour of wiping to be effective
  • Electrostatic “wrap effect” varies depending on type of surface sprayed

Fogging

What is fogging?

Fogging is a touch-less disinfection system that can be defined as putting small particles of hydrogen peroxide solution into the air and maintaining a silver hydrogen peroxide vapour throughout the space being fogged.

How does fogging work?

The fogging machine, or fogger as it is sometimes called, is a versatile piece of equipment that uses a fine spray to apply a chemical solution, often used for pest control, restricting the growth or mould or odour control. It is becoming increasingly popular as a means of sanitising surfaces.

The fogger uses pressure to create a fine mist (or fog) which is applied to the targeted area, the spray density typically being moderated by a manual valve to ensure the optimum effect. Depending on the type of fogger being used, it is possible to spray up to 12 metres, enough to cover a large room. The fine fog can reach into corners and difficult areas and may also penetrate porous surfaces.

Chemicals should be used with care though, as the spray or mist can linger in the air, so time should be allowed for the solution to settle and do its work. Keeping an area clear of people when treatment is underway protects any operatives from inhaling any unpleasant chemicals.

What are the disadvantages of fogging?

Since fogging relies on filling air inside a room or other area being treated with disinfectant mist, it is difficult to ensure proper coverage is achieved on all surfaces. This uncertainty makes it difficult to ensure cleaning dwell times required by disinfectant manufacturers for effective applications are met. Additionally, the application process is relatively slow compared to other disinfectant solutions.

  • World Health Organisation have deemed fogging ineffective against Coronavirus (COVID-19)
  • Unable to achieve “no growth” for C. difficile spore kill throughout connected spaces or rooms, and even for many systems in the same room as the aerosol generator
  • Large droplet sizes
  • Short aerosol suspension time (due to large droplets)
  • Reduced aerosol flow / penetration / Brownian movement
(aerosol size dependent)
  • Reduced ability to treat complex surface geometries and long vertical & horizontal runs
  • Small aerosol plume volume & plume density
  • Longer application times

Pump sprayers

What are pump sprayers and how do they work?

Before the rise of the COVID-19 pandemic, basic disinfectant pump sprayers or simple spray bottles have been the go-to sprayers for disinfecting, sanitizing and deodorizing applications. While still important, these applications were likely neither as large in scope nor under the type of scrutiny that exists in today’s new reality for janitorial service managers tasked with providing environments that are safe for occupancy.
Spray bottles and pump sprayers for disinfectants have been the most popular cleaning tools used for disinfecting and sanitizing applications. For the most part, these are inexpensive cleaning solutions that are readily available and easy to use – requiring little training or onboarding for the maintenance staff tasked with carrying out these applications.

What are the disadvantages of pump sprayers?

While these solutions may provide an initial savings on acquisition costs, their level of productivity leaves much to be desired. Operators will experience a slow, manual process that delivers inconsistent material coverage – often resulting in unwanted drips and runs that require an additional step to wipe sprayed areas to adequately cover potentially contaminated surfaces. Increased operator fatigue also plays a role due to the amount of times operators are pulling and holding the trigger and constant refilling of small reservoirs – especially on spaces with larger surface areas.

  • Inconsistent application coverage
  • Incomplete surface coverage
  • Additional wiping required

What makes Pure Decontamination different?

Highest Speed & Productivity

Our disinfection and decontamination equipment uses the power of airless spraying to deliver the highest speed and productivity when applying disinfectant materials. Maintenance professionals now have the flexibility to chose from a variety of sprayer sizes to match specific job requirements. In addition to providing unmatched application speed, the higher flow rates and larger material reservoirs also reduces operator fatigue over the course of disinfecting applications.

Consistent Atomization & Coverage

Our disinfection and decontamination equipment delivers the proper atomization required to quickly and consistently coat surfaces to disinfect and sanitize efficiently. Models come equipped with interchangeable tips and adjustable pressure to achieve the desired spray pattern and coverage required to meet chemical dwell time requirements.

Consistent Disinfectant Coverage From Edge to Edge

These new sprayers provide consistent application coverage that can be delivered in either high production or fine spray methods, depending on the needs of the job. These dedicated airless sprayers provide the fastest application method for effectively applying disinfectants to surfaces.