We frequent Samborees held in fairgounds that do not have full hook-ups, only W/E, and use the dump station on the FG. Typically there are 20 rigs waiting to dump at the end of the event. One trick I use is top off the Black and Grey tanks with fresh water before leaving the assigned space. Also I can hook-up the stinky-slinky to the MH and be ready to drop it quickly when it is my turn to dump. The extra water in the Black tanks acts like my flush system and the extra water in the Grey tank cleans the hose. When I'm at a full hook-up site, I'll take the extra time to throughly wash/flush the tanks. JM2¢...