Installed Vortex II in bathroom

You installed that? Is it true you can't run the fan when you flush because the smell will come back up into the trailer?

Some people say a fan can pull odor into the trailer from the toilet but I haven't had that experience yet. I would think closing, then flushing would eliminate the problem, especially if it's a properly vented and treated black tank. I use this stuff to treat it and it is AMAZING at eliminating odor and breaking down waste. https://www.amazon.com/gp/product/B007S0H5DU/ref=oh_aui_search_detailpage?ie=UTF8&psc=1