A Merseyside pensioner has invented a machine he believes could "kill Covid" – though experts have warned the success of such machines has not yet been proven.
Michael Ashley, a retired industrial engineer from Hightown, developed the air purifier in his own garage, and has secured funding to produce 500,000 units for use in schools, offices and hospitals.
He says it could transform the way public areas are made safe from Covid-19.
Mr Ashley also says the air steriliser has the power to kill Covid ten times over and would make safe the air that we share.
He said: "Covid is not going away any time soon, so a system that sterilises air has to have a place in our defence against this dreadful situation.
"This has brought me out of retirement with a small team of equally experienced engineers and we've created a range of products that will achieve sterilisation rates of 99.999%."
Michael says the machine uses germicidal ultraviolet light, which is proven to deactivate the DNA of viruses and other pathogens, destroying their ability to multiply and cause disease.
He continued: "This machine has way over 10 times the power that is required to kill covid as it passes through it."
However, Which? is urging people to use such machines with caution.
The consumer choice expert said: "Theoretically, an air purifier could have the capability to capture coronavirus, if the purifier had a particular type filter and an ultra violet lamp to then kill coronavirus.
"Crucially, though, none of this has been scientifically proven yet."
Air purifier manufacturer Meaco echoed this, saying: "An air purifier can help in maintaining your general wellbeing, which can only be a positive to try and stay safe from Covid-19.
"But, given air purifiers have not yet been tested with Covid-19, we would not want anyone to think that an air purifier could save them from Covid-19 and everyone should concentrate on the NHS and government advice first and foremost."
Receive newsletters with the latest news, sport and what's on updates from the Liverpool ECHO by signing up here.