​Can you trust your sanitiser to do a proper job?

23 September 2020 | Web Article Number: ME202020602

Food & Beverage
Industrial Cleaning

Burt Rodrigues CEO of disinfectant manufacturer Biodx gives his insight into sanitisers and their residual efficacy.

THE COVID-19 pandemic is a long way from over, considering infection rates at the time of writing this are roughly 100 times more than our early days of level 5 lockdown.

Over the last six months of living with the virus we’ve heard numerous stories of institutions such as schools, hospitals, shops and factories having to close down due to infection. This is often caused by the use of sub-standard disinfecting and sanitising products.

But even when the correct products and protocols are in place, can we rely on the people dispensing and using them to do the job properly?

The first issue here is to make sure the products bought do what they advertise. Numerous places have now sold out of ‘authentic’ disinfecting products registered through the NRCS (national Regulator for Compulsory Specifications) or the SABS.

Many of the products being sold right now simply don’t come with this type of guarantee. What buyers and managers of companies and government departments must do is if they don’t see these marks then at least the manufacturers must provide laboratory analysis demonstrating the product’s efficacy.

One of the biggest challenges is around the efficacy claims of chemical compounds.

The message to the public has consistently been that the best way of keeping the virus at bay is soap and water which historically has always been the blueprint for good health. In other words, if a surface, whether on skin, a floor or countertop isn’t properly cleaned with detergent or soap and water before disinfecting, the efficacy of the disinfectant or sanitiser is diminished.

​Can you trust your sanitiser to do a proper job?

The same applies to residual efficacy claims (the extended period of kill/destruction of a sanitiser or disinfectant on a surface after being applied), usually from several hours to several days.

What this means is that in the case of large areas in particular that need to be regularly disinfected, the responsibility to make sure these areas are now COVID-19 free comes down to the procedures carried out. If a surface is cleaned correctly. In other words, properly cleaned with soap and water or detergent leaving no organic matter behind, followed by an effective disinfectant at 6am, this should allow for up to seven hours of protection.

It all comes down to elbow grease – the effort that goes into the cleaning process. If, for instance, a hospital corridor is just swept, the disinfectant when applied will react with the organic material left on the floor and its efficacy immediately eroded, leaving people’s lives endangered.

The same goes for other common touch surfaces such as counter tops, lift buttons, ATMs, light switches, door handles etc.

If you follow the correct cleaning procedures then 90% of your problem is gone.

You’ll often hear excuses such as lack of staff, proper cleaning equipment. What can also happen is that companies will try to save money by cutting back on the right amount of disinfectant to be used. This can lead to a very serious problem.

If you lower the concentration and leave even 1% of virus on a surface you’ll create exponential resistance to your next application and in the future have to use a far higher concentration than originally specified to gain the appropriate kill/destroy rate, whilst in the meantime, leaving your staff/public in a highly vulnerable position.

The same rules apply around efficacy here as with surfaces. You go into a shopping mall, disinfect your hands and feel safe. But if your hands weren’t cleaned effectively with soap and water in the first place, the sanitiser is put on top of dirty or moisturised hands and your safety is far from secure.

Whether keeping your home, office, factory or yourself virus free, the one constant is human behaviour.

Be aware that any claims on the pack label of any disinfectant or sanitiser – be they efficacy (bacteria or virus kill/ destroy rate) or residual efficacy (duration of efficacy) - are subject to very specific conditions that usually require some sort of human effort before using.

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