Unlike a conventional toilet, RV toilets don't have a trap or a way to stop odors. When you do the second flush, you are letting the smell from your tank into the room. If you are trying to add more water to your black tank for the second flush, just hold the handle, or foot pedal, part way, to let more water ONLY in to the bowl, the when almost full, go all the way with a quick flush. I do hope you are keeping your black dump valve closed, and only opening for flushing every few days. Else you are trying to vent the sewer system through your toilet, and asking for other problems later on.
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LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT
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