On my last TT (2004 model) it seemed about every other year, I had to remove the aerators and remove plastic bits and junk out of them when the flow slowed down.
Don't know where it kept coming from, as there was never anything in the water filter, which I remove at the end of every trip.
I agree, there is sawdust and foam in every inch of these trailers!!!
Whatever direction we're traveling, that is the way the wind is blowing from.
2011 Rockwood 2604
1995.5 F350 CC4x4 PSD