Frequently Asked Questions


General Information


For more information on how our product kills SARS-CoV-2, which causes COVID-19, please see our product section on this page.

We are currently despatching as normal between Monday to Friday. The situation is being monitored daily and we will do our best to ensure service is not affected. On the small chance that any disruption to our service occurs, we will endeavour to get back to normal and keep you informed.

Where can I download your instructions?

You can find a link to download the instruction booklet, tube label and product safety sheet at the bottom of the How To section of our site here.

Privacy Policy

Please see our Privacy Policy here.

MyMAIL OFFER & Terms of Service

  • £9.00 off 1 x Cert. Essentials Pack, reducing it £8.99 at the checkout, and you can add other Cert. Cleaning products to your basket / order also. If you add more than one Essentials Pack to your order, you’ll get £9.00 one pack only. The MYMAIL50 code is one use per Customer (Email Address and/or Postal Address) so multiple orders cannot be made by the same customer.
  • MYMAIL50 is to be used by MyMail members only and reserve the right to cancel any orders from non-MyMail customers.  
  • Code is Active from 14th October to 31st October 2020
  • Free standard delivery applies with the Code and express next working day delivery at £2.99 can be added if you require
  • By using code MYMAIL50 you agree to subscribe to our email mailing List for Marketing Purposes. You can unsubscribe at any time using a link in any email we send you
  • Orders placed may take up to 21 days to dispatch if receives unexpected demand. We will use all best endeavours to ship your order within 24 hours of you placing the order
  • reserves the right to remove the MYMAIL50 offer at any time.
  • All other Terms, Conditions & Policies apply.

Please see our Terms of Service here.


We are always looking for new ways to improve our customers’ experiences. If you have any suggestions, questions or queries, please contact us here.

Order and Delivery Information

Placing an Order

If you are having difficulty completing checkout, please contact us here.

Cancel or amend an order

Due to the nature of our fulfilment process, we cannot make changes to your order once you have completed checkout. We will of course do our best to accommodate any changes you might need, so please contact us using the form here.

Where do you ship to?

Currently we are only shipping to the UK (including Channel Islands).

Who do you ship with?

We use Royal Mail tracked services for both our standard and express shipping methods.

Delivery Rates & Times

We use Royal Mail Tracked 24 for express and Tracked 48 for economy shipments. Orders placed before 2pm using an express service will be despatched the same day. Orders placed using our standard service are desptached within 48hrs but in most cases, within 24hrs.

Standard Delivery Express Delivery



How do I track my order?

You should receive an email when your order is despatched which includes a tracking link.

If you have an account with us, you can login and view your and tracking there.

If you don't have an account with us and didn't receive an email, please contact us here.

What happens if I’m not in to receive my order?

If delivery is attempted and no one is in to receive it, you should receive a card detailing how to retrieve or package or rebook delivery. If you did not receive a card, please contact us here.

International Customers

We currently do not ship outside of the UK. If you would like to see Cert. products in your region, please contact us here.

Business Customers

To find out more about how Cert. can help your business, please contact us here.


Which payment methods do you accept?

We accept the following payment methods:

  • Visa
  • Mastercard
  • Maestro
  • American Express
  • Apple Pay
  • Google Pay

Request a VAT Invoice

Your order confirmation includes a link to a VAT invoice. If you had an account with us at the time of ordering, you can view VAT in your order history.

If you can't find your order confirmation, or are having difficulty finding your VAT invoice. Please contact us here.

Payment Issues

If your chosen payment method is not being accepted, please contact your payment provider.

Returns and Refunds

Returning an item

If you are not happy with your items, or if you would simply like to return, please contact us here.

Returns & Refund Policy

To view our Returns and Refunds Policy in full, please click here.

Checking the status of your refund

If you have returned something to us and it has been more than 48hrs since we received it, please contact us here.


Using Cert.

How do I use Cert?

For a more detailed guide on how to use Cert, please click here.

Where can I use Cert?

Always test in an inconspicuous area before widespread application and ensure no damage is caused.

Whether for your home or business, you can use Cert on the common surfaces, such as:

  • Sink & Tiles
  • Bath & Tops
  • Toilet seats
  • Wooden surfaces
  • Glass surfaces
  • Bins
  • Floor
  • Wooden food chopping board
  • Alloy metal sink
  • Man-made high gloss kitchen worktop

What is the shelf-life of Cert?

Our tablets last between 3-5 years depending on storage conditions. Our expiry dates are clearly stated on packaging. Do not use after the expiry date.

When dissolved in water, the active ingredient in the solution lasts 48 hours.

What is the difference between a detergent and a disinfectant?

Detergents do have a cleaning effect, but to eliminate the associated microorganisms in dirt requires a disinfection.

Our tablets contain both, so there's no need to pre-clean. However, Cert. won't work on very dirty surfaces containing organic matter such as fat or oil.

How Does Cert kill 99.99% of bacteria?

Our unique formula contains biocides which actively destroy microorganisms. Our product has been testing to European Standards and is confirmed to kill SARS-CoV-2, which causes COVID-19.

Cert is efficient against bacteria, yeast, fungi and mycobacteria at the concentrations and contact times provided on the label.

Is Cert suitable for people with sensitive skin?

There are many factors which cause skin irritation and this can vary from person to person. We recommend you use gloves when using Cert.

Is Cert safe to use around animals?

When our product is used according to the instructions, Cert is safe to use around animals.


What Ingredients do you use?

The tablet is made up of three main components:

  • Biocides (Troclosene Sodium)
  • An effervescent base
  • Detergent (Surfactant)

Are biocides safe?

When following the product use guidelines correctly, our product is safe to use. Please refer to the booklet you should receive a booklet with your order detailing how to use Cert.

If you are missing the booklet, view our "How To" page here and download at the bottom of the page.


Where do you manufacture?

Cert. is manufactured in the UK at our headquarters in Billingshurst, West Sussex.

What quality guarantee can you give?

Tablets and finished products are tested and checked for compliance by our Quality Control Team. The manufacturing processes are developed and monitored under strict quality Standards such as ISO 9001:2008, Good Manufacturing Practice (GMP) and British Retail Consortium (BRC) and USA Retail Industry Leaders Association (RILA) Consumer Products Standard.

What EN tests have your products passed?

Each of our chlorine tablets have passed one or all of the following EN tests, please refer to individual products for tests passed for that product or contact us here.

EN 1276, EN 13697, EN 1650, EN 13704, EN 14476, EN 1040, EN 1275


Was Cert. tested on the SARS-CoV-2 virus?

CERT has been evaluated for virus-inactivating properties against all enveloped viruses (a group to which SARS-Covid-2 belongs), under standard EN14476:2013 +A2:2019 and passed the test (inactivation ≥99.99%) at 1 min contact time. The strain used was modified vaccinia virus Ankara, the legally nominated and internationally recognised surrogate of SARS-CoV-2, as it is extremely rare that testing can take place on the actual SARS-CoV-2 virus.

Has Cert. been independently tested?

Leading independent experts from across Europe have tested Cert. in a variety of conditions. These include Dr Jochen Steinmann of the highly respected Dr. Brill +Partner, GMBH, Institute for Hygiene and Microbiology in Bremen, Germany. He has certified that Cert. effectively destroys all enveloped viruses in one minute, including the SARS-CoV-2 virus - which causes COVID-19.

See Dr Jochen Steinmann's Report HERE

The strain used was modified vaccinia virus Ankara, the legally nominated and internationally recognised surrogate of SARS-CoV-2, as it is extremely rare that testing can take place on the actual SARS-CoV-2 virus.

Dr. Andrew Kemp PhD, who is a specialist researcher in disinfection and decontamination, carried out rigorous testing on Cert. using the Kemp-Hirschman test for “wet in use” disinfectant products.

At the critical period - 5 minutes after treatment - Cert. killed 100% of the bacteria species used to contaminate the surfaces. The types of surfaces tested were a wooden food chopping board, an alloy metal sink and a man-made high gloss kitchen work top.

Listen to what Dr. Andrew Kemp has to say about Cert. (Audio Clip HERE)

Interviewer: “Do you think it's important to use hospital grade disinfectant in the home?”

Independent Scientific Researcher Dr. Andrew Kemp: “Yes, I do, and the reason for that is there's an increasing amount of evidence showing a link between antibiotic resistant bacteria and disinfectant resistant bacteria. The inappropriate and poor stewardship of [traditional] disinfectants in the home may in fact increase the number of resistant bacteria that we see. So using hospital grade disinfectants that are stronger and more active that should reduce the chances of that occurring”

Does Cert. comply with Government regulations?

Cert. complies with Public Health England’s cleaning principles on how to keep potentially contaminated and frequently touched hard surfaces COVID-19 free.

Public Health England are very clear about what can destroy COVID-19 outside of a healthcare setting. They say you should use: “a combined detergent disinfectant solution at a dilution of 1,000 parts per million available chlorine (ppm”

That’s Cert.

The second states: “a household detergent followed by disinfection (1000 ppm Follow manufacturer’s instructions for dilution, application and contact times for all detergents and disinfectants.”

While it is possible to follow the manufacturer's instructions, Public Health England specifically provides a warning to be careful that there is a risk of creating toxic gases when you mix a detergent and bleach together. Cert. avoids any confusion and difficulty by delivering a convenient and safe system which guarantees the precise concentration of a cleaning and disinfectant solution together.

And the third: “if an alternative disinfectant is used within the organisation ensure that it is effective against enveloped viruses.” Again this is possible, however most disinfectants don’t specifically classify that they are effective against enveloped viruses, so you’d have to be an expert in this field to achieve this.

You can see Public Health England’s guidelines on how to protect hard surfaces against COVID-19 here.

Still have a question? Contact us here.