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Old 09-22-2014, 03:19 PM   #1
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Grey tank smell??

I have noticed a "black tank" type smell after I haul my trailer somewhere. It's pretty bad and lasts a day or two after we park. I have flushed the shower(we don't use) and bath sink. We hardly ever use the vent fan and haven't flushed anything yet. The smell is pretty bad.

Should I try to flush/sanitize the gray tanks? If so, then a suggestion on that would be helpful. I have read some about this and don't see a "fit" for my problem. The system is stock as far as I know. The smell doesn't seem to be about the sink or under.

At this point I am interested in any ideas.


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Old 09-23-2014, 12:12 PM   #2
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Exact same thing here. We do have a smell in our main bathroom from our shower after towing the camper for any "decent" distance.

Wife bought some gray tank deodorizers and we drop one into the sink (shared with the shower). You run water and it immediately dissolves. Bought it from Walmart.
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Old 09-23-2014, 12:23 PM   #3
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Cool. Thanks. I will get some.


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Old 09-23-2014, 12:26 PM   #4
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You need to keep the drain P traps filled with water. Sometimes, when you empty the grey tanks, the suction will pull the water out of the traps.
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Old 09-23-2014, 11:24 PM   #5
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I love how much this forum hope me overcome the novice learning curve - I didn't know about keeping water in the traps...


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Old 09-24-2014, 08:23 AM   #6
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Quote:
Originally Posted by OldCoot View Post
You need to keep the drain P traps filled with water. Sometimes, when you empty the grey tanks, the suction will pull the water out of the traps.
Interesting note about dumping the gray pulling the water out. I didn't know it would do that, but it does make sense.

But, I rarely dump immediately before leaving any more. I usually do it the night before. The next day I'll get a shower before we hit the road (sometimes even after I've disconnected everything).
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Old 09-24-2014, 08:29 AM   #7
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also if the trailer sits for a while between uses, the water in the traps can evaporate and allow odor to come thru. dump some Pinesol, Lestoil or similar thicker-than-water in the traps and it will stay a lot longer.
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Old 09-24-2014, 09:11 AM   #8
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Shower (Traps) in a RV are Not as deep as others. They can (Drain/Evap) easy! Youroo!!
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Old 09-24-2014, 10:19 AM   #9
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Shower (Traps) in a RV are Not as deep as others. They can (Drain/Evap) easy! Youroo!!
And apparently the traps in Sabres are some new fangled trap that isn't a "P". It is straight through but has some nodules on the inside that act as traps.

This looks like it is it:
http://www.drainmaster.com/main/2011...to-the-rescue/
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Old 09-24-2014, 10:25 AM   #10
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I always run water down each drain aftere dumping to make sure there's water in there.
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Old 09-26-2014, 08:50 PM   #11
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Found an article on the Geo Method for treating holding tanks. Sounds like it might solve your problem and be a good pm for the black & gray tanks
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Old 09-26-2014, 09:11 PM   #12
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If the grey tank is full when dumping and the vent is closed off by the water you may be sucking the water out of the p traps until the roof vent is cleared. May not be your problem but may be worth knowing.
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Old 10-11-2014, 11:06 PM   #13
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Im kinda wondering why your Grey tank stinks at all, do you have a garbage disposal inside or something?

We've dumped the grey on the lawn using a 5/8 hose adapter before.. It's not had any smell.. or if any perhaps a bit of soap.. nothing foul.

aren't using anything in the grey to control odors either..

How many have stinky grey tanks?
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Old 10-11-2014, 11:58 PM   #14
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A common source of bad odor (especially the dreaded "rotten egg" smell) can come from the water heater.

If you ever store the camper for more than a week or two, be sure to drain the water heater to avoid that smell.

To deodorize the holding tanks, we really like "Simple Green" because it's pretty cheap and we like the powerful pine smell. (Anything with the name "RV" next to it seems to cost 5-10 times more than regular stuff, it seems!!)
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Old 10-16-2014, 06:51 PM   #15
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I fill my tanks with water and let them soak for as long as I can. Hopefully this loosen things up. I'll do this a couple of times a week seems to keep things clean Jim
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Old 10-16-2014, 07:27 PM   #16
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Make sure the grey water valves are closed when dumping black. If open the black water can enter the grey water tank.

Most know this. But u would be surprised. A camper here was all valves pulled and left that way. A lot of campers will tell u that they only close grey valves when they move. To each their own I guess.


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Old 10-16-2014, 08:04 PM   #17
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Tank odor

jrlebaron, Here is the link for the Geo Method I mentioned in an earlier post, I have now done the tanks twice this way and don't have any odor issues. In the article it also discussed the proper order for dumping tanks. https://sites.google.com/site/cbruni/. Will be winterizing the unit next week after one last weekend at Algonquin Prov Park.
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Old 10-21-2014, 03:59 PM   #18
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I know this sounds silly but if it is a Sour Smell, Are you emptying the Hotwater heater between Trip's... The Left over water in a water heater can mold and smell if not fully emptied "Plug the Plug..
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Old 11-07-2014, 11:30 AM   #19
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A few possible ideas...

Sanitize your grey tank before you head out next time, we use a bleach solution a few times a year to sanitize all of our tanks. We fill the fresh water tank and all the lines with the beach solution a few days before we head out.

About a day before we head out we use that water to fill the grey and black tanks and travel with them full for the sloshing to our destination and then dump when we get there. We flush the water heater all the lines as well when we get there.

We also always make sure there is water in all the traps before we leave.

When we get home we drain everything and then blowout everything with a compressor.
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Old 11-15-2014, 07:56 PM   #20
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We also leave the plug in the drain in the shower and in the sink.
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