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Old 06-15-2009, 11:15 PM   #1
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Join Date: Aug 2008
Location: Enumclaw, WA
Posts: 2,617
Keep holding tank odors at bay while in storage

If you store your rig for any extended period of time (especially in hot climates) the water in your P-traps can evaporate leaving a clear path from your sinks and shower straight to your holding tanks and allowing odors to come into the rig. This can be really bad if you have a bathroom sink plumbed to the black tank as we do!

To stop this from happening, we run a small amount of water down each sink and the shower every couple of weeks to keep the traps full and working as they should....


"I can fix it, and if I can't fix it, I can fix it so no one can fix it!"
Ed & Wendy
2009 Georgetown 378TS | 1998 Jeep Wrangler | 1998 Skeeter ZX202C
Nights camped in 2009: 53 | Nights camped in 2010: 55
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Old 06-16-2009, 08:50 AM   #2
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Join Date: Mar 2008
Location: Southwest Alabama
Posts: 3,283
Excellent advice. You can also pour a little mineral oil in the drains to prevent evaporation. It's lighter than water so it floats on top and doesn't harden like vegetable oils would. It works if you don't have access to your rig for long periods of time. I've even heard of people adding it to their batteries. I'm not brave enough to try that though.

Salem 29RKSS Pushing a 2500 Mega-Cab CTD!
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Old 06-24-2009, 09:25 AM   #3
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Join Date: Apr 2008
Posts: 156
I will have to try the mineral oil thing... that sounds pretty good.

We park our trailer in North Texas, (103F yesterday), and yeah, the odors can be a big issue. We added a venturi wind vane to the sewer vent on top of the TT. The slighest breeze pulls out the odors and it works very well.
Nights camped in 2010 = 21 nights

2008 Chevy CCab 5.3L 4WD Z71
2008 FR Surveyor 291
Champion Genset
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Old 06-25-2009, 07:56 AM   #4
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Location: Wichita Falls, TX
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We use Downy liquid fabric softener in our tanks. It coats the inside of tanks. The smell is contained, the tank walls become slippery. We haven't used biodegrable toilet paper or chemicals in 5 years. We do used the "Ultra Downy", which is more concentrated. So 1-1.5 capfuls is enough for active use. 1.5-2 for storage.
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