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Old 01-26-2015, 04:58 PM   #1
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Sensors stuck on full

Had the black tank sucked out while dry camping in Quartsite AZ.
Now the sensor reads full. Any help how to get rid of the full lights?
Thanks in advance to all who help.
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Old 01-26-2015, 05:20 PM   #2
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So, this is a common problem with using the "sucker" method of dumping the black tank. Without the ability to turbo flush after dumping, sludge and slime on the walls will short out the terminals for your indication system.

This video will explain the problem and will show one way to prevent it; there are others, but I chose them.

https://www.youtube.com/watch?x-yt-c...-ts=1421914688
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Old 01-26-2015, 06:45 PM   #3
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A bag or 2 of ice cubes dumped in the toilet along with a few gallons of water will clean the black holding tank while you drive. The ice scrubs the tank and then melts.
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Old 01-26-2015, 06:47 PM   #4
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Quote:
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A bag or 2 of ice cubes dumped in the toilet along with a few gallons of water will clean the black holding tank while you drive. The ice scrubs the tank and then melts.
This does not work as well as "the net" would lead you to believe.

When set up at a campground with a pump out service, not being able to turbo flush is a real issue.
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Old 01-26-2015, 07:03 PM   #5
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Quote:
Originally Posted by TGR View Post
A bag or 2 of ice cubes dumped in the toilet along with a few gallons of water will clean the black holding tank while you drive. The ice scrubs the tank and then melts.

See this video for an actual demonstration

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Old 01-26-2015, 07:22 PM   #6
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Quote:
Originally Posted by Herk7769 View Post
This does not work as well as "the net" would lead you to believe.

When set up at a campground with a pump out service, not being able to turbo flush is a real issue.
X2. A hot water sit followed by a turbo flush is about the only effective way I'm aware of.. and I just about seen it all. The ice cube method 'seems' to make perfect sense, but that's just not the way the world turns.

There ARE some pretty decent sensor replacements out on the market, but for the most part, it's just learning to recognize the signs.. burping, change in pitch in your gray tanks, etc.
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Old 01-26-2015, 07:39 PM   #7
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When you get ready to leave fill the black tank with water. Pour some tank cleaner in her and drive it. On the home stop at a dump station close to home and flush her for 30-45 minutes. If that don't work repeat the process. Most sensor cleaners will list similar direction. The key will be lots of water. Good luck!
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Old 01-26-2015, 09:25 PM   #8
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I watched the video! Great and lots of fun.

You will be better off using a product like RV-Digest-It or RID-X to dissolve that crud. A 24-72 hour soak will eat up all the slime and sludge allowing your next pump out to flow a lot smoother.
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Old 01-26-2015, 10:53 PM   #9
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Thanks all. I will watch the video and see what happens. Will try the others also if needed.
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Old 01-27-2015, 01:52 AM   #10
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Add a powder water softener to the tank it helps breakup build up and detaches crusts from the tank. Disbelieved it the first time I was told but did it any ways after a 6x flush and you wouldn't belie the crud coming out right after a full 2 flushes of clear water. You need to let it soak overnight. We now add it to every fill of our black tanks.
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