Originally Posted by Chuck_S
There are redundant backflow devices on all the flushers I've seen. But what's the obsession with flushing the tank? Use of a good enzyme treatment and Odorlos makes this unnecessary. No stink and the residual enzymes continue eating poo after the tank is empty. Won't happen if you flush these out.
Flushing at the dump site is especially egregious as folks will take 15 minutes there and hold up a long line. Unless there's no line on exit I just drive home and pump my tanks into my sanitary sewer at home
I am very weight limited with my towing setup, so I don't tow very far with any tank with water in it. When I show up at a site, I am empty and when I leave a site, I am empty. So, over just a weekend camping, I don't fill the black water tank enough to get a good dump of it. Therefore, I end up pumping water into it on Sunday morning to get a good dump before leaving.
That's accomplished through the flushing connection, either from the water connection at the site or by pumping the remains of the freshwater tank into the flushing connection through the outdoor shower hose if there is no water hookup at the site.