Advisory On The Use of UVC Sterilisers In The Home


[UVC sterilisers]
Ultraviolet-C (UVC) radiation has wavelengths of 100nm - 280nm and is in the spectrum of the sun’s radiation that we are rarely exposed to, as the ozone layer in the stratosphere prevents UVC rays from reaching the surface of the earth.

Ultraviolet Germicidal Irradiation (UVGI) is a disinfection method that uses UVC. This method of disinfection has been applied in the disinfection of surfaces and sanitisation of drinking water. UVC sterilisers which use UVGI have been applied in the healthcare sector and in research. The efficacy of UVGI against a range of microbes has been demonstrated in numerous studies. 1-2


[Challenges in using UVGI]
UV disinfection has a short turn-around time (less than 30 min) and does not leave any chemical residues behind after treatment. However, the following factors must be considered when it is applied, whether as a fixed installation or as a portable system:

1. There must be line of sight from the UVC source to the surface to be disinfected for treatment to be effective. High-touch points that are obscured may be missed. For example, surfaces of door handles, handle bars, or toilet flushes that are not directly in the line-of-sight will not be disinfected.

2. The effectiveness of UVGI in inactivating microorganisms depends on the duration of exposure, intensity, distance of surface from source and wavelength of the UV radiation. There is therefore a need for careful calibration and monitoring.


[Is UVC safe?]
UVC poses potential health risks such as eye injury (e.g. irritation and inflammation of cornea) and skin injury (e.g. erythema). The World Health Organisation (WHO) has advised that UV sterilisers should not be used to disinfect the hands or any areas of the skin.3

Chronic exposure to UV radiation can also accelerate the skin aging process and increase the risk of skin cancer. Care must be taken to ensure that the irradiated space is not occupied during UVGI, and measures must be in place to prevent accidental exposure. 4-5

UV products are to be kept out of reach of children.


[Advisory]
As UVC radiation can cause eye injury (e.g. irritation and inflammation of cornea) and skin injury (e.g. erythema), NEA does not recommend the household use of such products. Other alternative disinfection methods are available. Please refer to NEA’s list of active ingredients and household disinfectant and cleaning products for disinfection of the COVID-19 virus.

For reference please visit: https://www.nea.gov.sg/our-services/radiation-safety/advisory-on-the-use-of-uvc-sterilisers-in-the-home

Dear Customer,

Thanks for your support all the times.

Sometimes we proceed free gift event. But due to the limited quantity, it could be out of stock earlier than the planned date.
Free gift can be changed any prior notice and it can't be provided sometimes.

Missing of free gift & damage of free gift can't be the reason for refund or exchange or resending of free gift.

Please note this and we seek your understand.

Yours Sincerely,
Let's Mary Store.

Dear Customer,

These days, we received some cancellation. We respect customer's choice.

Please cancel your items before "dispatch/shipping date" is updated.

once dispatch/shipping date is updated, our guys engage in packing and dispatch process to delivery company.
If the cancellation is submitted, when dispatch dated is updated, processing fee will be occured for repacking and operational process.
(If there is no shipping update, the money will be refunded straight away to you account.)

We seek your understanding. It affects other customer's delivery timing too. Our aim is 1~3 working days delivery for S'pore customers.
So please cancel your order when it's "on request".

Thanks for your cooperation.

Yours Sincerely,
Let's Mary Store.

Dear Customer,
Please note that Singpost doesn't provide any tracking service for normal mail.
So we are not able to compensate for any damaged or lost parcel in case of normal mail.

Please be safe using via courier service. We will do refund or resend in case of courier service.

Thank you so much! :)

Dear Customer,
We have received some inquiries on delivery timing, amendment of option type and delivery address
Also some customer leave a memo. But all the orders will be process based on registered information on Qoo10.

So if any changes are needed, it should be done by re-ordering. All the orders are not able to be processed based on memo.

And our courier partners delivers on their time schedule.
So we are not able to guarantee the timing. And the memo will be ignored as the courier will not deliver on the timing you request.

If you have further inquiry for delivery, please contact Qxpress
Qxpress : +65-6434-8400

Thanks for your understanding.

Yours Sincerely,
Let's Mary Store.

Dear Customer,
We have received some inquiries on change of option, quantity and delivery address.

We would like to help but not able to change from our side. Please cancel the order and order again.
Once the status is changed into 'On delivery', Not able to cancel the order.

So please proceed it when it's 'On request'. Thanks for your understanding and help!

Yours Sincerely,
Let's Mary Store.