Oh man, down at my camper one of our new neighbors got a brand new camper. When it came time to empty his grey water for the first time, he put on the garden hose cap, hooked up the hose and a little 12v pump to get it up the hill to the French drain and pulled the grey water handle. Nothing more than a trickle came out the hose. Uh oh. Another neighbor and I looked at each other, knowing what had happened. Some jerk at the factory, probaly on a Friday mislabled black and grey tanks. We did what any grown men would do when about to unleash several gallons of your neighbors sewage on the ground at your feet, paper, rock, scissored for it. I won. Before I could hand him a pair of gloves he had that cap off the outlet, and was picking the tp and "stuff" out of the house outlet. "gawd man, put on some gloves " was all I could think as I assumed the supervisor position and finished my cold beer. Eeeeewwwe! You find out real quick who your friends are when you black water backs up in a campground.