IMO, a bit of difference between galley gray water, and shower gray water. My FW, as I'm sure many others, have at least 3 tanks. Mine are all 40 gal tanks, and I can empty my shower water separately. I have a cap, with a garden hose attachment that could be used for this.
Several rustic CGs that I enjoyed staying at were very limited on sewer use. The owners said shower water could be slowly drained in a private ditch, well behind the camper. I am thinking they did not tell everyone, but likely someone they considered responsible. I can't remember if I ever used that option??
Jerry
