ddivinia,
As far as I know there is no filter on the system from the factory but there are aftermarket filters that can be added to the return line. I added one to my jeep since I use a hydro assist ram and didn't want to ruin it with any particles. When I changed the power steering pump and box on my wifes Cherokee the warranty required that I add a filter to keep the warranty.
Magnefine Inline Transmission Power Steering Filters
I have hydro assist on a Jeep, works great with large tires in the rocks. The steering is awesome offroad, steering wheel doesn't kick around and works really well. I don't really like it on the street, the steering is kind of numb and has no feedback whats so ever. It steers fine and the wheel returns to center without issue I just don't like the feel. Maybe in the Dodge it would feel different or better, I don't know.