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Unknown to many folks, many RV toilet system do NOT use goose-neck piping system - to keep the bad smells within the holding tank. If one opens up the toilet valve and looks directly down the hole (assume one's RV had straight pipes), one can see the top of their inner holding tank contents. Yes, they see the TP and other "stuff". When one turns the bathroom ceiling fan ON (especially on high speed) while the bathroom door is closed, and opens the toilet valve, the "bad smell" is sucked up / out of the open toilet valve hole. After all, replacement air always takes shortest path first.
Methods to resolve:
Add lots of water to each previous flush. Thus, one "dilutes" the bad smell inside the holding tank. And, because one is using more water to flush, they must empty their RV's holding tank more often - since Tank fills up faster. This method reduces the time interval when the "stuff" starts to stink as well.
Add lots of chemicals down the toilet hole. This dilutes and/or masks the bad smells. This becomes costly in the long run. And, many folks like me don't like using chemicals.
Keep the ceiling fan OFF when sitting down and when flushing. Especially when the bathroom door is closed. Thus, air replacement "up the hole" doesn't happen. Only turn the ceiling fan on AFTER one washes their hands and leaves the bathroom (with bathroom door closed).
Install a store bought 12V fan and install within the black tank's air vent pipe. With this upgrade, simply turn this special fan ON, sit down, do one's "stuff", then flush the toilet. The vacuum created inside the black tank sucks air "down" the open toilet hole (and pushes out its roof top vent pipe). With this upgrade, its near impossible for "bad smell air" to naturally float up and out the open toilet hole. And best of all, NO chemicals to add or extra water to add either. Simply install this fan and use it.
If wondering, I created my own RV roof top "power vent" system using ABS Pipe, 12V computer fan (35+ CFM) and a manual off/on switch. Very simple DIY creation. After I installed this special upgrade, I never got bad smells inside my TT's small bathroom again.
For store bought fan solution (that can be installed within RV walls or within empty roof cavity), surf:
- click here - IMO, this inline fan should be factory build (since RV toilet plumbing doesn't use gooseneck piping). If wondering, my next TT with onboard toilet will get this special fan installed again - without hesitation.
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