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Old 09-01-2015, 09:55 AM   #1
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Grey water smell in motorhome

We have a Itasca Sunrise 32V, and nearly everytime we turn the fantastic fan on we great greywater smell. We open a window as suggested by an RV Tech, replaced the sewer vents under both sinks, had the tanks steam cleaned, bleached the tanks and put in greywater conditioner in regularly. We are at our witts end as to what else we can do. Has anyone else experienced this issue and able to solve it?????
Thanks, Art
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Old 09-01-2015, 10:06 AM   #2
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We have a Itasca Sunrise 32V, and nearly everytime we turn the fantastic fan on we great greywater smell. We open a window as suggested by an RV Tech, replaced the sewer vents under both sinks, had the tanks steam cleaned, bleached the tanks and put in greywater conditioner in regularly. We are at our witts end as to what else we can do. Has anyone else experienced this issue and able to solve it?????
Thanks, Art
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A search here on iRV2 for "grey water smell", (or "gray water smell"), will find many suggestions and solutions.
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Old 09-01-2015, 10:31 AM   #3
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I always replace the vent caps with a Cyclone Sewer Plumbing Vents. No problem with smell since it keeps a negative pressure in the RV most times even while boondocking for extended periods and tanks way to full. Cheap and fast fix.
There are other brands which I haven't tried that are probably just as good. I have no interest in Cyclone or Camco other than being a customer. Also, as mentioned, if running a roof or stove exh. fan, you need to have a door or window open for makeup air or it will pull from the tank vents.


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Old 09-01-2015, 11:13 AM   #4
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Hi Art,

One thing to take a look at are the air admittance valves in your drain plumbing under your sinks.

I'm far from a plumbing expert so take this with a grain of salt... In theory all drain lines should have a vent. However; this isn't always easy/possible. So, some drains have an air admittance valve that let's air in when there is a suction (water flowing down the line) but then close to prevent the stinky air from the tank from flowing out (into the living space).
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Old 09-01-2015, 02:04 PM   #5
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I use Odorlos, same as black tank treatment. Works for us.


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Old 09-01-2015, 02:17 PM   #6
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I just put 2 Cyclones on this weekend they solved my problem.
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Old 09-01-2015, 07:22 PM   #7
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I put the Camco cyclone on a couple of years ago. I replaced the air admittance valves about the same time, thats were the smell seems to be coming from, it seems like they don't seal properly when the fan is on because that is were the smell comes from. How to stop the smell????
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Old 09-01-2015, 07:54 PM   #8
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We have the same problem with our coach. Any depressurization of the cabin will cause the stink. I have replaced the air admittance valves to no avail. I am certain that the stink is leaking in from the air admittance valves, but changing them has not reduced the problem. I've been wondering if there are better valves available?

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Old 09-01-2015, 07:59 PM   #9
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We have the same problem with our coach. Any depressurization of the cabin will cause the stink. I have replaced the air admittance valves to no avail. I am certain that the stink is leaking in from the air admittance valves, but changing them has not reduced the problem. I've been wondering if there are better valves available?

Jim

These are pricy but effective:

http://www.amazon.com/Studor-20341-M...mittance+valve


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Old 09-01-2015, 09:13 PM   #10
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This is what worked for me. You don't need to be moving or a breeze to create a negative pressure, a fan keeps negative pressure 100% of the time.

Lil' Stankerâ„¢ In-Line Deodorizer Fans
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Old 09-02-2015, 07:24 AM   #11
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These are pricy but effective:

http://www.amazon.com/Studor-20341-M...mittance+valve


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Thanks Steve. I'll give this a try.

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Old 09-02-2015, 07:25 AM   #12
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This is what worked for me. You don't need to be moving or a breeze to create a negative pressure, a fan keeps negative pressure 100% of the time.
Lil' Stankerâ„¢ In-Line Deodorizer Fans
No add on gadgets or gizmos are necessary if everything in the sewer system of a RV is working properly.
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Old 09-02-2015, 07:31 AM   #13
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This is what worked for me. You don't need to be moving or a breeze to create a negative pressure, a fan keeps negative pressure 100% of the time.

Lil' Stankerâ„¢ In-Line Deodorizer Fans
Great idea. However this won't address this problem. I understand that the OP's grey tank is not vented outdoors through the roof. The grey tank system is designed with air admittance valves under the kitchen and bathroom sinks. These air admittance valves are supposed to let air into the grey tank and keep air escaping from the grey tank back into the room. Doesn't always work too well.

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Old 09-02-2015, 09:14 AM   #14
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The grey tank has to have a vent. The tank would not fill with water if air could not get out. Air admittance valves are one way (in) valves. There is still a vent somewhere.

Mel-s-----Since everything in the sewer system in this RV is not working properly, then add on gadgets or gizmos may be necessary.
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