Have you ever stuck your nose next to the exterior vent with a toilet full of piss? I assure you, it smells like piss. I have the same toilet, same basic venting configuration (I vent out the side with a mushroom shaped RV vent, and upgraded the stock fan for more air flow). With 2 gallons of urine in the tank, the area immediately next to the vent smells like urine. Especially so on hot, muggy summer days. There's no way it can't ... it's designed to blow air over a bucket of urine. That being said, I never get any sewage or feces type smells, but I HAVE definitely noticed a distinct urine odor every now and then. My solution was to cut a 1.5" hole in the bottom of the Nature's Head urine unit itself, install a 1/2" bulkhead in the bottom of the urine reservoir, a drain line, a quick disconnect, a shutoff valve, and then I plumbed the hose to the back of the bus. When I'm on the highway I can pull over, walk outside, open the valve, drain the piss, and close the valve again. As long as the urine reservoir isn't near full the smell is barely noticeable. Added bonus, I never have to manually walk a 2 gallon open top jug of urine into the woods. That stuff absolutely REEKS, especially if it sits a week, and especially if you have a few dehydrated, partying guests using the commode. Plumbing the drain was the single best decision I made with that toilet, and the parts I modified are cheap enough to replace and not attached to the main unit itself except for 3 short phillips screws. I'm all for composting toilets and think they're a much better option when compared to the maintenance and emptying of black water and gray water tanks ... but to say they don't smell at all, in my opinion, is false.
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