I read this thread with interest.. I spent my working life having to deal with the proverbial .... When you have 100 - 400 people on an aircraft ready to go and the toilets don't work, or they just flew 8 hours with no toilets and immigration won't let them off the airplane, who you conna call?? I've seen some very nasty stuff stuffed down toilets, never bothered me but most guys I worked with couldn't handle the real bad stuff especially if it's steaming.:)
What it did learn was always use lots of water when flushing after dumping, this ensures that the "steaming pile" directly under the tank entry is always washed away, you don't want that "building up". Second most important is the pre charge, sure it helps keep stuff moving around and is supposed to be done on aircraft but for my RV it cuts down on capacity so ZERO pre charge for me, I just make sure the waste coming out at the end of flushing is clear. TP.. yup it collects on the sensors and stays wet, holding water after the sensors would have dried, this gives false quantity readings, a good flush takes care of this every time. Last but not least keep the stinky TP out the garbage and flush it. Now on to more important things.. toilet roll installation? Feed from the front or the rear, lets hear.