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Old 08-26-2014, 11:26 AM   #11
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Originally Posted by Tunce the traveler View Post
I would save that initial flush and just toss a lit match down the hole to get rid of that #$%%%^^&& smelling air! Dave gave me that idea.
Dave? As in Super Dave?

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Old 08-26-2014, 11:41 AM   #12
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Kind of off topic, but if you empty a 5 gal gas can into your vehicle and leave the sealed empty container in the sun it will swell up like a balloon. Pretty much the same effect with an empty black tank. The vent should release the pressure but you will still tend to get some build up of gas fumes with an empty or near empty tank. Chemicals and some water will help. When you open the flush valve on the toilet you may get an initial puff of #$%%%^^&& smelling air. Should only happen with the initial flush.
I don't understand how this could possibly happen. If the tank is vented out the top (as it is), there is no way for the tank to build any pressure at all. Unless your vent is clogged, which is entirely possible. But in a normally operating black tank, how could any pressure possibly build? In your gas can example, the container is sealed, the pressure is created because the temperature inside the bottle is higher, thus creating pressure because the expanding gas inside the bottle has nowhere to go. Unlike in a black tank, where the expanding gas exits the vent pipe.

Now, if you have your fart fan on, creating negative pressure inside the RV, and you open your flush valve, the gas from the tank will back flow out of the tank, through the toilet, and right into your face (ask me how I know?!) because the pressure in the bathroom is lower, and the gas will take the path to the lowest pressure area.

What am I missing?
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Old 08-26-2014, 11:54 AM   #13
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I can recommend using "5 Star Happy Camper" in your black and/or grey tanks to eliminate all odors.
I've used this product for 4 seasons now with stellar results. Super easy to use and 100% effective.

Link to 5 Star Happy Camper Website

Product can also be ordered on Amazon.com with free shipping for Prime users.

Use 1 oz of product with a gallon or 2 of water after each tank dump and done. Even comes with a measure scoop.

I have no affiliation other than a being a happy user.
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Old 08-26-2014, 02:19 PM   #14
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Dave? As in Super Dave?

Ha Ha Ha Ha ROTFLOL
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Old 08-26-2014, 03:07 PM   #15
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I don't understand how this could possibly happen. If the tank is vented out the top (as it is), there is no way for the tank to build any pressure at all. Unless your vent is clogged, which is entirely possible. But in a normally operating black tank, how could any pressure possibly build? In your gas can example, the container is sealed, the pressure is created because the temperature inside the bottle is higher, thus creating pressure because the expanding gas inside the bottle has nowhere to go. Unlike in a black tank, where the expanding gas exits the vent pipe.

Now, if you have your fart fan on, creating negative pressure inside the RV, and you open your flush valve, the gas from the tank will back flow out of the tank, through the toilet, and right into your face (ask me how I know?!) because the pressure in the bathroom is lower, and the gas will take the path to the lowest pressure area.

What am I missing?
Maybe you missed the part that the vent should prevent a buildup of pressure. The gas can [sealed] was simply to demonstrate how air will expand when heated and unless all of it is released, you will tend to get a puff when you open it up. The OP doesn't indicate a blow out a candle wind from the toilet, just a bad smell. That bad smell is from the bad air [gas or ust smelly air] that exists in the tank. An appreciable amount of air would indicate that the vent may be clogged. A poof is probably just trapped smelly air being pulled into the bathroom as a result of a negative air pressure in the TT caused by an open window or exhaust fan.

Didn't really want to get into a scientific argument. Suspect you probably kind of sort of understood my original point anyway.
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Old 08-26-2014, 03:46 PM   #16
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How would one tell if there vent is clogged?
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Old 08-26-2014, 03:52 PM   #17
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Go up there and suck on it...you'll find out pretty soon.
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Old 08-26-2014, 04:19 PM   #18
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Yeah right. Not!
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Old 08-26-2014, 04:31 PM   #19
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Yeah right. Not!
Honestly in the past 45 years I have never heard of a stopped up vent pipe.
It's the same as your house. There is normally two much gas that prevents any animal or insect from ever going there. There is a cap over it that may get crushed down or in most cases knocked off by a limb or something.
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Old 08-26-2014, 04:47 PM   #20
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Go up there and suck on it...you'll find out pretty soon.


A little (and I mean very little) whiff of stinky gas on occasion is one thing, and is often quite normal. But for the toilet valve, or any valve to make a "poof" or release pressure at all is a problem. That's all I was trying to say. Your black tank (assuming it is functioning properly) will not build pressure, regardless of changes in temperature. Will it get stinky? Well, sure! It holds poo for a living!
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