We have the Theford mini (not the model, just their smallest, think it is the 175)
Use paper from the rv store
Use blue stuff he handed me
Sat once for 30 days in rig
No smell
It is a casset type
Unlatch top
Carry to bathroom
Empty
No smell
Dump in fresh water, swirl
Dump
Repeat three times
Add water and blue stuff
Back in the rig
Sadly don't have usage more than 4 days
Cost me about $60 on line
Small, easy to use and clean
That's the "End" of this post