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Old 07-10-2014, 02:36 PM   #1
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Black water

I read the Smelly Bubbles thread and how he cleaned out a clog...my black tank shows 100% full and dumps without a whoosh - I think I may have a plugged tank (used trailer, don't know how the previous owner treated the tank) and I wonder how one would go about cleaning it. My question is how do you poke and prod without draining the tank on the ground nor taking up an hour at the dump?


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Old 07-10-2014, 06:04 PM   #2
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If you have periods of non use, you can add various septic tank type bacteria products and let them do their work. Then, hopefully, take it to the dump station with a better result.

You can use our search feature to find the products available.

If your tank is just draining slowly, you might also try the old trick of ice in the tank. Just before hitting the road, make sure you've dumped and then added about 1/3 tank of fresh water to the tank. Dump a couple bags of ice cubes into the tank and drive around to have it slosh against the wall and dislodge stuck on "stuff".

Best of luck


Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.

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Old 07-11-2014, 09:54 AM   #3
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I just went through a days worth of "playing" with this stuff. My first step was to try and determine roughly where the blockage was. Was it in the vent tube? Was it between the tank and drain? Was it between the toilet and tank? I was able to narrow it down thanks to a "gurgle" sound heard after flushing. I knew it was in the bend right before the tank. I tried chemicals, tried boiling water, a fish etc. i finally succeeded with 10 minutes worth of a toilet wand about 5' down the toilet. Just go back and forth with the wand. I was able to hear the sound of the water change when it would contact paper. I went at it for a while and i'm now convinced that it's all gone.
Hope this can help you somehow. Good luck!
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Old 07-11-2014, 10:35 AM   #4
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I have found out that the toilet paper blockage is from not enough water usage when flushing the toilet. Let the water run a little with the toilet flapper opened this will insure that the paper is wet enough.

Now when emptying the toilet use the black tank flush if equipped and also dump between five and six buckets of water down the toilet. This will insure that the tank is empty and the gages will work alter the emptying of the tank. Takes a little longer but it will clean the tank.

Just a suggestion for you to consider.

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Old 07-11-2014, 10:39 AM   #5
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Next time you travel put several bags of ice down your toilet. Sloshing around will break loose lots of "crud". jfyi
2003 Teton Grand Freedom. 2006 Freightliner Century 120 with Detroit 14L and Ultrashift.. Full time going from job to job. Building and maintaining plants across the USA. Sold 2006 Mobile Suites 32TK3
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Old 07-11-2014, 11:05 AM   #6
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At one time my black tank was "plugged" and what I did to clear it was to leave black tank valve open going to my septic tank and ran my garden hose in to the toilet area with a shut off valve on it and a 6' section of hose on the end of the valve. I installed one off those short brass hose fittings that are used to spray down a driveway on the end of the short hose. After sticking short hose down into the toilet to the tank, I opened the water hose valve and sprayed down the inside of black tank until everything was broken up and run out the sewer hose. That cleaned it all up.

Now after I dump the black tank and have the dump valve closed I put about 8 gallons of water down the toilet so the black tank (100 gallon) will have plenty of water to break down the solids.

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