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Old 04-26-2018, 06:37 AM   #1
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False Reading Black Tanks

We are half way through our first 2 week road trip and emptied both tanks 2 days ago. We are parked at some friends house in Charlotte NC pretty much just sleeping in our camper with minimum use of tanks. Our black tank monitor says it's 3/4's full. Knowing this to be pretty much impossible we are wondering why it's giving a false reading and what to do about it. We'll be leaving for Nashville tomorrow and driving the Natches Trace and want to make sure tanks are empty.
Thanks for any insight!
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Old 04-26-2018, 06:48 AM   #2
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We experience the same issue with the monitors on our black tank. Even though you have dumped the tank, "stuff" can still be stuck to the probes in the tank. I always use a cleaning wand in the black tank after every trip. That seems to be the only thing that will get everything off.
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Old 04-26-2018, 06:52 AM   #3
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I suspected it might be the probes. We used the cleaning wand on the Casita but have not on the Escape which actually was why we got the window in the bathroom. Thanks so much, will do!
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Old 04-26-2018, 07:59 AM   #4
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I noticed when I used Oxy-Chem drop in black tank pods with 1 gallon of water that initially my tank would have false readings after we traveled with it. . After a few uses it would suddenly go from 2/3 to empty I have the Horst probes so it's not paper or residue I suspect whatever they are made of coats the walls a bit and is conductive when it is at a higher concentration.
A few flushes dilutes it.
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Old 04-26-2018, 08:21 AM   #5
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The sensors on our black and gray tanks are pretty much useless. After awhile you just develop a sixth sense as to when you need to dump.
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Old 04-26-2018, 08:35 AM   #6
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Key to the black tank usage is to keep the contents as fluid as possible and to minimize the solids. We use campground restrooms whenever possible for serious #2 business. Try to dump the tanks frequently to minimize having the sensors covered up for longer term. Use a wand to spray the interior of the tank.

After 5 years, our black, grey, and fresh water tank sensors all work perfectly and have never had any issues whatsoever. If fact, I have a wand since the trailer was new but have never even used it to clean the inside of the black tank.
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Old 04-26-2018, 10:34 AM   #7
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Great information, thank you all so much! Learning as we go. I did put a Walex Bio-Pack tablet in the black tank with some water when we emptied it. Tank is still reading 2/3 full. I am finding that for $5 we can dump at truck stops so when we leave here tomorrow we'll stop and dump again then rinse well put in another tablet with some water and ck the reading.
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Old 04-26-2018, 11:35 AM   #8
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With the black tank you can always just look down the hole.
I'd fill it with liquid before driving to the dump, and then empty it.
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Old 04-26-2018, 12:09 PM   #9
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Thanks will add liquid before we dump.
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Old 04-26-2018, 01:00 PM   #10
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Drive over a few speed bumps with the tank full of liquid.
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