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Old 08-15-2015, 08:28 AM   #1
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Smelly black water tank

I know that this has been discussed many times... Every time I flush the toilet, a strong rotten egg smell comes up out of the toilet. I've ruled out propane and battery smells. I've poured in chemicals to the blackwater and gray water tanks. I only smell it from the toilet. Question is.... What concoction can I make up, dump in and drive it home? I've read about dish soap, calgon water softener, oxyclean soap etc... I used the blue stuff in my potty in my previous pop up, I am now using the camco orange stuff. Trailer has been sitting for 3 weeks since our last trip. Would really like to make up something that I can dump in before we leave for home.

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Old 08-15-2015, 08:40 AM   #2
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I also have a similar problem and like you started using the orange tabs instead of the blue liquid. I am going to switch back and see if that helps. It seems when I switched is when things got smelly.


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Old 08-15-2015, 08:45 AM   #3
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Try using Happy Camper black tank treatment. Go at least double on the first few doses and cut back to the recommended dose once the smell is gone.

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Old 08-15-2015, 08:49 AM   #4
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Make sure your toilet vent is not blocked.

Also, don't run your fantastic fan while flushing.

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Old 08-15-2015, 08:52 AM   #5
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Make sure you bathroom vent fan is not on. You can also add a few gallons of water ans some ODOBAN ( available at big box stores,) when the tank is sitting empty.

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Old 08-15-2015, 09:06 AM   #6
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Make sure you flush the tank when dumping? May be leaving solids in the tank.
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Old 08-15-2015, 09:11 AM   #7
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When you dump do you use the black flush system? Do you dump every time? Never carry waste when traveling to next CG if possible. We dump and clean on every move and add the blue Thurford chemical and add about a gal of water to it. TT sets for 2 to 3 weeks and no issues doing it that way. I've done this for years and never had a odor issue. Proper PM is a key factor. I see it's a new tt so might also check vent. Later RJD
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Old 08-15-2015, 11:56 AM   #8
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I use the Geo Method and I always flush my black tank. I have never had a smell from my toilet. Also, as others have mentioned, don't run your exhaust fan and make sure the vent stack is not blocked.

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Old 08-15-2015, 12:01 PM   #9
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I use a clear elbow on the tank connection. I flush the tank until the water runs clear. That can take longer than you think. We never have an odor. With our motor home in the past, I just dumped, flushed down a couple of bowls full of water to flush it out and threw in a blue tab. It always stunk no matter what concoction I put in it. Keeping the tank clear is the key.
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Old 08-15-2015, 12:05 PM   #10
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Agree with V-Lite.... To avoid the bad odor, you need to flush and rinse til CLEAR, (through clear elbow). You can tell... it looks milky if not clear yet. Once clear, its looks like clear water through that see through elbow. Can take up to four times of filling with water and flushing before the water runs clear. Worth it tho so you get no solid build up.

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