Sorry AJ. I am not adept at using this website. I didn't notice that you had left the message about the pump filter. I think that all of you have access to my replies, though.
I am attaching photos of both sides of the filter and the filter holder. There was some minor residue, but nothing that looked like it could cause the black spots that are on the laundry. It was very easy to clean the residue.
My next step is to run those white sheets through. I'll report back.