I am back in the workshop sewing & accepting orders.
There is a limited amount of remove-able filters I can make from the Kirby Micron Magic HEPA filter vacuum bags I purchased for this purpose. The filter supposedly increases your protection *BUT* it does make the mask harder to breathe through. Most customers stop using them. This is why I make them very easy to put in place and very easy to remove.
The filter is an additional $5 per mask