I ordered more filters and valves for my face mask, and lo and behold, they actually arrived four weeks later.
I can use a variety of liquids to wipe down the neoprene mask, and also put it in the sunshine to disinfect. The plastic valves clean up the same. So far, that has been the trickiest part of safe masking, because the preferred cleaning fluid is rubbing alcohol and that disappeared months ago. I recently acquired a liter of hand sanitizer, and given it is liquid and not gel and is 80% isopropyl alcohol, I may use that.
These are the charcoal filters normally used to remove car exhaust and particles smaller than dust or smoke that you get in urban air quality failures. These are PM2.5 filters and I first got some ahead of my trip to London in summer 2019, because they had some crazy air situations the summer before my trip.
Each filter is rated for about 16-24 hours of use which is something I can monitor. My research has uncovered that the COVID-19 virus is smaller than what this traps, but this will trap just about everything else out there right now (like regular flu), and this is better protection (when used properly) than an N95 or plain fabric.
When I bought the neoprene mask it was the summer of 2018, WA State was blanketed by smoke from British Columbia and I figured I would just invest right out of the gate in a smoke mask for life given the state of climate change. Almost two years later, and I’m stupid proud of myself.