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Old 12-15-2012, 05:44 AM   #1
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When I tow my TT, I get black tank smell in the living area which soon goes away with open doors or windows. Now, I'm not a new camper so I know some of the reasons. I've closed and opened the roof vents with no difference. The traps have water in them. I purchased one of those vent caps that turn in the wind and pull air out of the tank when you drive by venturi effect but winter came too early and I'll be putting it on in the Spring. Anyone have success with this issue?
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Old 12-15-2012, 08:07 AM   #2
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Check your toilet and see if it is holding water. It should have a small amount of water in the bowl AFTER flushing. If not, you may be sucking up odors from the tank while driving.

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Old 12-15-2012, 09:20 PM   #3
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Yup, got water in it. Like I said, I'm not new to campers. Just looking for something unique here that I haven't seen before.
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Old 12-16-2012, 02:44 AM   #4
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I believe that once you install your new vent cap, which sounds like the "Cyclone", you'll find a significant improvement. I did and also made sure I had water in the bath P-trap and I no longer have odors after towing.
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Old 12-16-2012, 02:56 AM   #5
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Thanks, that's what I was hoping for. After 1 tow behind camper and three motorhomes, I've never had this problem but I've heard others who have. I made sure all my P traps were filled with water. I think the wind getting into the top of the vent pipe might be the culprit. Anyway, come Spring, I will be putting on the vent cap and see what happens.

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Old 12-16-2012, 07:13 AM   #6
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Had a similar issue. Turned out that a fitting on the black tank was either cracked or came loose permitting the odor to come into the RV. Only happened when the tank was more than 1/2 full. A mobile RV repair service took care of the issue and it has been trouble free since.
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Old 12-17-2012, 11:00 AM   #7
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Are you using enough or the right chemical for your size of holding tank? I have never had an issue (thank god) with an odor problem from the holding tank.
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Old 12-17-2012, 10:04 PM   #8
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All black tanks smell! Use all the chemicals you want, there are some things that just don't change! Grin!! Yes, I believe I'm using the right amount of chemicals. We don't get the smell unless we have driven for a few miles. I'll post a follow-up in April <Grin>.
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Old 12-18-2012, 01:29 PM   #9
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I know you are used to cleaning black tanks but I used to get the odor until I switched to the geo method (the.version that uses bleach some of the time) and flush my tank clean every trip. Since then no issues. The geo method got rid of the residue build up that caused the odor. Also I assume not being new to this that you keep water in your black tank at all times.
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Old 12-18-2012, 08:20 PM   #10
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Yes, keep some water in tank all the time. I try to keep at least a gallon or two but it's not as easy with this TT. I'm used to having a flush system in the motorhome and this unit has none but it doesn't seem to matter if the tank has just been dumped or i'm on the way to a dump station. I've never used the "geo" method and must admit I'm hearing about it for the first time. Use bleach, you say?
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