I have used these for type for 20+ years. No problems or complaints yet.
Dual cartridge mask
It did the job just fine
All the local supply stores were sold out of PSE and I had a job to do. Fortunately TS Global shipped this right out.
Fits ok works like its supposed to
I can breathe
I have been using this mask to take care of COVID patients. I was surprised that I could breather better than when using N-95 masks. So far I haven't gotten the virus which can only prove how effective it is!