Yes you can use the SS to back-flush the Thetford, just have to learn how long to let the water run, I have it written down on the hose which I can't get to right now (love magic markers). I will use a stinky slinky if I am at a place that has sewer connection, (but I wear gloves so no messy). I boon dock a lot so I have devised a method where I can park the camper in the garage and use my ss to drain the tanks into a 4 inch sewer line. (commode just inside the door with trap door and clean out in garage). If I left stuff in the camper I open it in the drive, do the drain while I unload and clean things inside, run water through Thetford and flush, remove the SS, drop her down and into the garage as well.
I do from time to time make sure I use a dump station, just cause. I have never had any issues after 2 years of use.
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