@mcdc1959 I see an environmental allergy doctor who tests things individually and breaks it down for example what types of tree pollen, and they put together a customized mixture for the injections. I was trained in how to do the injections at home. This is immunotherapy.

The HEPA filter I have also has carbon filtration that are granules. It is a cylinder and the carbon is the first stage. It is an inch of carbon in the cylinder wall and the inside lining is the HEPA filter that is a piece of special felt. That filters out all the dust and carbon dust. The company that makes this is E L Foust located in Wisconsin. I think their website is foustco.com. I repack the filter myself outside because the carbon is very dusty and make sure not to breathe any of it using a respirator. This isn’t the nicest looking filter on the market, but it uses an industrial fan motor and has no plastics or adhesives that would out gas fumes. I’m sensitive to chemicals and fragrances, so we don’t use cleaning products that leave fragrances behind.

Jennifer