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Old 04-13-2015, 05:51 PM   #1
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Black Tank/Sewage tank

Hey guys got a question to ask.

I have a 31BHS, and I'm in Kansas when I first got here my trailer froze over, well I finally got it unfrozen and in working order.

It seems as if my sewage doesn't completely empty and when I hit my guage meter it shows it still to be full after I empty it. What can I do to get it completely empty I've used the tst liquid and little packets nothing seem to help the situation.

Does anyone have any idea how I can get it fully empty, i kind of feel like there may be a blockage of toilet paper, I always use the septic safe toilet paper. Any help or advice is greatly appreciated.
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Old 04-13-2015, 06:14 PM   #2
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Could be something caught on the sensors. Not sure if your trailer has a black tank rinse system built in to try and the flush tank out. If it does I would hook up the water supply to the the connector for the rinse system and keep the black tank valve closed. Turn on the water and When the tank gets about 1/2 to 3/4 full shut off the water and then open the black tank valve. You might have to do this 2 or 3 times to get any solids out of the tank. Just be careful and keep a close eye so you don't overfill the tank. I bought a clear elbow to attach to the drain pipe which will let you see if there are any more solids after you flush the tank.
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Old 04-13-2015, 06:35 PM   #3
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Sadly mine doesn't, I can just open and close the valve I put some wire together and put it down and it seemed to help clean it out some but not a lot.

I'm trying to get it to completely empty, I had thought of connecting some water hoses and physically doing it that way not sure how well that will work though.
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Old 04-13-2015, 06:53 PM   #4
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That might work. Again I would try doing it with the valve closed. And when it gets about 3/4 full shut off the water and empty the tank. This will get any solids that might be stuck on the sensors.

If not you might have a bad sensor.
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Old 04-13-2015, 07:02 PM   #5
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Here is a attachment that might help flush the tank.

Holding Tank Rinser with Valve - Camco 40103 - Sewer Flushing - Camping World

Also here is a video on flushing black tank.
https://youtu.be/I6sv4d3PsTo
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Old 04-13-2015, 08:07 PM   #6
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So maybe I just had solid blocking my sensor cause I used my wire again and now its gone down to 1/3.

I mean does a travel trailer black tank ever completely and fully empty out?
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Old 04-13-2015, 08:24 PM   #7
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The sensors are rarely accurate. I keep an eye on consumption and usage. The black water flush is also not very effective for tank cleaning. If you search the site you'll see lots of threads on the topic. There is also a video of a guy that made a clear acrylic tank and used various methods of black tank rinsing and none were completely effective.
Last fall I used the black tank flush until the water ran clean. Then I used another members,McFarmall, method of dumping pails of water down black and grey water drains. It took 7, 5gallon pails of water until it ran clear. I've also experienced the dreaded tp mountain and bad odour issue as a result of not using enough water to flush. Next time I'll know to pour a pail or 2 down the toilet to solve the problem.
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Old 04-13-2015, 08:38 PM   #8
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I've been very fortunate that I only had the bad odor one time and that was when we first bought the trailer and didn't know about the tanks....

I do believe I'm going to throw some water down there and get it thoroughly cleaned out before my next trip.
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Old 04-14-2015, 07:59 AM   #9
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Gauges never work right I stopped using my black and gray tank gauges a long time ago
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