Follow-Up:
Add a small screan filter like the one on your clothes washer water line to the filter in the drain pan in shower. Cheep at any hardware store. We did not like the shower curtin (Rubber)that was in coach so my wife went to dicount store and purchased one and cut it to be same size as original and put snaps on and it is super. We also rerouted shower water to gray warter tank so we can ues every day. It is super.A motor home is like a trck house. You buy it as is and then you make it work for you by making a few personal changes.
Here is a link that might be useful: