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Originally Posted by rodgerc1967
Thanks for all the responses. Very helpful and good ideas. I have the anti-siphon valve under the sink. Should it be open (easily twists to left or right) or should it be tight? I will mess with it to see if the odor is reduced. And I will not run the vent fan unless not using it makes it worse. The odor is confined to the bathroom and on the outside where the flush values are located. There are no drips and my toilet bowl holds water. I also let water run into the tank to be the fecal matter is covered by water. This is my first motor coach and don't want it to be my last. My wife is ready to bail. Thanks again and any further help is appreciated.
Rodger
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you mention this is your first motor home,are you properly cleaning out your black tank?Check out some videos on tank dumping,it could be as simple as not properly cleaning tanks.After I empty mine,I fill it with water and empty it again.Then I add a cup of laundry detergent,fill it again and empty it. Then I flush it one more time to make sure the tank and the sensors are thoroughly cleaned! Yes I'm anal about it but have never had a problem with years of boats and motor homes!There are also new chemicals available that don't perpetuate that old holding tank smell of years ago.Some of the older formaldehyde type toilet chemicals made the smell worse! good luck