I've broadened the topic to include pathogens that could include viruses, bacteria, and fungi - and coined the product name, ChloroCloud™. Due to the corrosive nature of chlorine, this version uses PVC tubing and fitting. I should mentioned that my experience with HCl gas and liquid chlorides goes back decades, and I was co-inventor on U.S. Patent 5,599,425, Predecomposition of organic chlorides for silicon processing, a commercial product sold by Air Products under the trade name, Trans-LC.
Today's check of the storage bin containing the ChloroCloud device 12 hours after increasing the concentration to 1 to 1 ratio of distilled water and standard laundry grade bleach. As noted in yesterday's post, the fumes are still noticeable and reminiscent of a hotel indoor swimming pool. I could envision this ChloroCloud device being placed inside a mailbox for months between refills and disinfecting mail.
In researching how long COVID-19 may survive on a surface, there is already quite a bit of information available. Site https://science.howstuffworks.com/life/cellular-microscopic/long-can-viruses-live-on-surfaces.htm references researchers at the National Institutes of Health, who tested forms of coronavirus. They found these viruses may live on plastic and stainless steel for more than 72 hours, cardboard for more than 24 hours, and copper for less than 4 hours.
The concentration of chlorine vapor will need to be balanced versus time needed to kill pathogens. The SDS (safety data sheet) from Clorox at https://www.thecloroxcompany.com/wp-content/uploads/cloroxregular-bleach12015-06-12.pdf mentions for handling to "Handle in accordance with good industrial hygiene and safety practice. Avoid contact with skin, eyes, and clothing."
Planning to reach out to CDC, NIH and known virus experts for ways to test the effectiveness of ChloroCloud at killing pathogens. I've also identified some commercial applications I plan to contact for possible collaborations.