Originally Posted by windguy
why the permanent toilet over a portable?
It might be a case of "grass is greener" as I've never had a blackwater system, however I don't like dumping the portable or cleaning the tank afterwards (when that's even possible). With the exception of a pit toilet (which technically I don't think you're supposed to put sani-blue in) it's always an issue to dump, and I don't feel any better about splashing blue/green sewage water around public restrooms than in my own house.
The best technique I've found is to have the receptacle toilet flushing as you pour, but even then splashback is inevitable, one flush never does it, and the whole process is nasty on at least 3 levels, one of which, again, is the blue dye. If you're on the road, you can just shove that bad boy back in the van (there is really no place to clean it on the road), but more often than not it's a whole trip's worth to clean out at home. And even if you've used it only for liquid waste, multiple people's urine sitting in a bucket for days with toilet paper and little else is not a joy in itself.
If you've used it for anything but peeing, no matter how many times you fill, slosh and dump in the house toilet again at some point you're either hosing some amount of sewage onto your property or leaving it in the porta-potti. Even if I wanted to clean it on the road I definitely use more water in a full rinse out than I even carry in the SMB.
So now there is blue poop water splashed all over the bathroom (God forbid you left any of the good towels out), tiny bits of raw sewage washed out in your yard and your porta-potti is relatively clean and fresh for next time. Relatively. And light and easy to move for the first time since last time.
Other people seem to love them. They say it's no problem to dump and never smells. I've gone with and without sani-blue, dumped on arrival at home and left things to stew. I've dumped in three of my own houses' toilets and several places while traveling. With the exception of pit toilets, it never goes well for me. Not using it is the only thing that works really, really well.
The idea of a dedicated dump area that is like a giant drive-in utility sink sounds like heaven. Not having to lug gallons of waste into a bathroom via the most awkward container... it seems nice. It just sounds so much better to have one end of the system for sewage- an end that is outside the van at all times- instead of the middle of a two part container that goes back inside. On top of that, a larger tank and no hesitation about using the system because it's so messy to empty later.
Again, it might be a grass looks greener on that side of the fence thing. It's not something you can reasonably change post build and it's way, way better than not having anything it but it's not something I think is super clean and easy, which seems to be the minority opinion for reasons I can't fathom.