Many, including myself are removing the filter altogether. I never drink water from the tt's plumbing as it has been sitting in the pipes weeks between uses in the warm weather and may have something growing in there. The filters only add to my worries as many have carbon in them for taste and odor removal. This carbon also removes the chlorine which could kill the bacteria growing in the pipes. I will wash dishes, shower, and flush my toilet with it but bring bottled water to drink. Also, I've read many posts of filters either not tighten properly or coming loose and flooding a lower compartment. I had problems with mine and will replace it with an outside, inline unit.
Both travel trailers I've owned had this factory debris everywhere. I understand it's pretty common and after seeing the assembly line at the Goshen rally, I can see why. They assemble them so quickly. Just sweep it up as you find it and move on.
2016 Cedar Creek 36ckts
2015 Ford F-350
4WD SRW Diesel