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Old 10-11-2015, 12:06 PM   #1
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Unhappy Techma Thetford Toilet Problem

Techma toilet flushes fine, but releases very strong sewer gas smell as it refills. It has never done this at any other RV park that we have stayed at. We recently just arrived in Mesa, Arizona and after a few days it began to have this problem. Any ideas what causes this? Thanks so much.

Tish & Gary Bengtson

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Old 10-11-2015, 12:50 PM   #2
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If the odor arises as the pot fills, it is most likely hydrogen sulfide in the water. It could be natural in the water, or it could be "iron bacteria" growing in your potable tank. There is no way to know which. Talk to your neighbors about it. If it is in the water, you can add filters and that may help. If it is in your tank, sanitizing your tank will probably help.


A lifelong waterman and his bride going dry places for as long as the fuel money lasts.
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Old 10-11-2015, 01:03 PM   #3
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Any chance that you are running an exhaust fan in the room that is drawing the odor up from your black tank?

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Old 10-11-2015, 03:19 PM   #4
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That is a tough one. Are you sure the odor is coming from the bowl area?
Myron & Deborah
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Old 10-11-2015, 05:02 PM   #5
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As mentioned, a Fantastic Fan running can suck fumes from black tank when flushing. Perhaps something may be causing a positive pressure to build up in the blank tank and being released into the cabin when you flush. A few things to check:

Is there something in the vent stack clogging it (animal nest, etc)?

Has the vent stack dropped, causing the bottom end to be below liquid level in black tank?

Wind is coming from different direction and causing a downdraft in the vent tube (happens with cheap factory vent caps). Shame they just don't put these on at the factory.
George R. - Fulltiming since January '03
2007 Newmar Mountain Aire 3991
2012 Chevy Malibu LT1
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Old 10-15-2015, 07:12 PM   #6
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Thanks all. Very helpful. I especially will look for venting issues.
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Old 10-17-2015, 08:26 AM   #7
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I always make sure the window is open when the fan is on to prevent the fan from pulling stinky air from the tank.

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