Another Black Tank Thread - photos tell the story

I try to get my black tank rather clean because the trailer is stored indoors. I use the black tank flusher and sometimes a homemade handheld wand. Regardless how I rinse the tank, there is always something left.

Try this next time you think that the tank has been properly flushed; add five to ten gallons of water to the clean tank and drive to the campground. Now using a clear elbow, dump right away and see if the water is still clear. I'll bet there will still be brown trout swimming downstream.