No protocols for measurement of results, just a combination of procedures from different well-designed-and-conducted (IMO) experiments as presented in several papers downloaded from PubMed, as well as info posted directly on CDC site (no link here; anyone who’d “smarter than a third grader” can find the info for themselves with a simple web search. Not gonna hold hands and be “internet crossing guard” for adults):
Took a used disposable N-95 and (per CDC) subjected it to 170°F temps for 20 minutes (CDC says 165 for 15 mins), after having soaked it in a solution comprised of 75% ethanol, 25% concentrate of a medical-grade disinfectant (compatible with ethanol) that remains after ethanol evaporates.
Stored in disinfected (with above ethanol solution) vacuum sealed bag for use as filtration media–in place of HEPA filtration media-as supplementary filtration in a simple two-layer cloth mask that has the exterior treated with a hydrophobic compound to resist moisture (“droplets” anyone?)
This will be a very slight step down from the HEPA filtration media. . . but is plenty for allergy season. 🙂
N.B. Will also be just fine for wearing into those stores that “can’t” stay open w/o “masked bandits” for customers.