It resolved (the water back up) with draining the gray tank. I just couldn't believe it was full so fast. It had only been about 4 or 5 days since I dumped my tanks, but being hooked up to the campground water really makes the pressure better than merely using the water pump and the onboard water tank. I've learned to slow down the water stream and to shut it off when I'm washing my hands, etc.
I will buy the zip-it thing this week cause it still has the slow draining issue while showering. I hope it's not the configuration like you're saying, but it could very well be. I know for sure there is hair down there, though. It would have to improve somewhat.
You know what else bugs me about the whole shower thing? I can't get water to stop leaking from the shower hose. I put some plumber's tape on the threads and tightened that thing up good. But the connection (kind of swivels around) that is below the threaded area is where the water sprays out from. My shower would be a heck of a lot more exciting if all the water would go through the holes they are supposed to exit from.
