I have a portable Flojet Macerator .....use it to pump black & grey 75' with a 2' rise to sisters house cleanout
Takes 10 minutes for black...10 minute cool down---15 minute grey then couple minutes of rinse water thru pump and 3/4" discharge hose
Been using it since 2008
Not too concerned with the 'cleanliness' of WASTE Tanks ---they get dirty next time you use them
After dumping I add 2 full toilet bowl flushes and 2 sink full back into the tanks so bottom stays wet...anything left behind stays wet and doesn't stick
Haven't had a clog/plugged up toilet/waste tank in all the years of camping/RVng
Liquid to solid ratio is the key.
Folks are way to OCD about RV waste tanks.........probably don't think twice about the same plumbing system in their S&Bs :S