i do
its great to not only dump but flush grey and black tanks couple times after a trip.
also makes pack up and load up to leave campground a lot faster. if we are at a fhu site i usually dump grey tanks to reduce weight. i always like black tank to be full before dumping. if we are at a state park for 2 or 3 days with water electric at campsite and community dump station i will haul everything home and dump