Sewer Tank Flusher

I think it best to add water before you go to dump station; let the drive shake things up. At the dump station, connect all, start the black dump and then start the flush. As the black dump appears to be finishing , stop the black, and start the grey dump -1 to 5 min. This lets the black fill little with clean water. Stop the grey early to finish the black. Then shut off the flush, drain the black, then complete the gray dump. It lets you do all with out spending an hour.