Thanks, we must have a clog. We are taking it in for maintenance tomorrow and will add that to the list. We drained grey and black before we took showers. I was not clear about dog. I don’t wash my dogs in there. What has gone down is just the normal shedding they do that floats in the air along with dirt tracked in despite a rug. We will be more careful if this going forward ! We are at Fort Robinson,NE. It is a very nice campground. Good spacing between sites. We have a view of prairie, buttes and wildflowers( some bugs and bees getting in with door opening).