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Old 02-27-2016, 08:18 AM   #11
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Yes, I've see new comers do this. When hooked up to full service, they leave the gray and black valves open. This opens up a clear path for the black tank odors to travel up to your shower and sink drains.
Wile it is very bad to leave the black tank valve open, there is nothing wrong with leaving the gray tank valve open. You should not get odors in your RV. If you do, there is a problem with your plumbing. All of the fixtures have traps of some form or another and it is impossible for the sewer odors to get past them and into your RV. The most common problem is the cheap air admittance valves used by RV manufacturers. They should all be replaced with code approved house type air admittance valves made by companies like Studor, Oatie and others. Do not use the cheap black valves that came with your RV. Replace them before they become a problem you can't work out.

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Old 02-27-2016, 08:42 AM   #12
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Wile it is very bad to leave the black tank valve open, there is nothing wrong with leaving the gray tank valve open. You should not get odors in your RV. If you do, there is a problem with your plumbing. All of the fixtures have traps of some form or another and it is impossible for the sewer odors to get past them and into your RV. The most common problem is the cheap air admittance valves used by RV manufacturers. They should all be replaced with code approved house type air admittance valves made by companies like Studor, Oatie and others. Do not use the cheap black valves that came with your RV. Replace them before they become a problem you can't work out.

Bruce
Bruce is correct. If you have water in your traps it will block any odors on the other side of the trap. Masking the smell with chemicals is not fixing the problem, it's hiding it. Check the plumbing.
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Old 02-27-2016, 09:18 AM   #13
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We had the same problem just after getting our TT several years ago. I installed the Cyclone vent on the black tank vent and never had a problem since. Then, had some smell coming from the kitchen sink drain and after using the tablets, decided to put another Cyclone vent on the grey tank vent. Never had had a problem since. I also put a cover on my trailer each winter and put a small plastic trash can over it not to puncture anything. Has worked well over the years.
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Old 02-27-2016, 09:20 AM   #14
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I doubt this is your issue... but don't run your bathroom (fantastic) fan when you flush! It'll suck the smell out of your tank real quick! 😵
My first guess would be a blockage in the vent.


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Old 02-27-2016, 09:40 AM   #15
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Google GEO method thats what I have been using for the last seven years and no bt odors. With the black tank water is your best friend. Had an odor problem in the kitchen sink area on our at that time one year old rv. Turned out to be the air admittance valve. Bought two good valves at home depot and replaced the kitchen valve along with the lavatory valve, no more odor.
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Old 02-27-2016, 09:45 AM   #16
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Bruce is correct. If you have water in your traps it will block any odors on the other side of the trap. Masking the smell with chemicals is not fixing the problem, it's hiding it. Check the plumbing.
This should be correct when water in the the trap is dormant. However; with water passing thru the trap (faucet open) there is a gap that will allow odors to escape toward any negative pressure source (fan, window open, etc.) and it doesn't take much for that odor to permeate throughout an rv and stick around for sometime. I typically leave the grey valve open while connected to a sewer (I don't boondock) but there are occasions (mostly not) when this issue does arise and closing the grey tank valve cures it. Seems more likely to occur when rv park is at capacity. My coach has no plumbing issues.
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Old 02-27-2016, 09:53 AM   #17
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with water passing thru the trap (faucet open) there is a gap that will allow odors to escape toward any negative pressure source.
This is absolutely untrue.

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Old 02-27-2016, 10:09 AM   #18
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The air admittance valve is a new one on me; never heard of it. Apparently it is an alternative to a roof vent?
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Old 02-27-2016, 10:12 AM   #19
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You are leaving the tank closed while camping and then flush when its close to full or after two to three days of camping. I ask this because I don't know how many campers I've talked to that think your suppose to leave the black tank valve open when camping. We always use two of the chemical packets after we flush the tank. and don't forget to add at least a gallon of water with the packet. Then when were finished camping we flush the tank from full to empty several times. Then add about three gallons of water and two packets and leave that in the clean tank until next trip. Unless your winterizing. Then we empty until the spring.
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Old 02-27-2016, 10:15 AM   #20
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The air admittance valve is a new one on me; never heard of it. Apparently it is an alternative to a roof vent?
It really is an alternative to a roof vent, although you will still have a roof vent for your tank. The air admittance valve acts as the separate vent for the fixture it is venting. In a house, this vent would connect to another vent that goes through the roof or it would go out the roof on its own. The air admittance valve is designed to allow air into the drain after the trap so the trap is not sucked dry by the flow of another fixture or the draining of the tank. Most RVs have them only on the bathroom sink drains and kitchen sink drains. The shower or tub is "wet vented" by the sink's air admittance valve.

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