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Old 09-17-2016, 08:38 PM   #1
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The horror . .. .. . The horror. ... . . The horror

So, the level indicator for my black tank seems to have two indications; 3/4 full or full. Even if I drain the tank, the monitor still shows 3/4 full. I can look straight down the toilet and see that the bottom of the tank is not covered with . . .. .. ahem . .. . . 'water'. No matter how much of the afore mentioned water that is added changes the reading until suddenly, without prior warning and cruelly, the 'full' light on the monitor comes on and I am faced with the dilemma; 'to flush or not to flush. That is the question."

You can imagine my delight.

It would appear to a logical mind that the sensors in the black tank are corrupted ( and who could blame them). I have tried several remedies including dumping a number of bags of ice cubes down the drain and driving around, various cleansers and a load of Mr. Clean who claims to be able to 'clean everything in your house in just a minute!' But nothing seems to help.

Does anyone out there have any suggestions about a product that will do the job or a method I can try that will not require me to actually entre the tank?

Thanks in advance.
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Old 09-17-2016, 08:47 PM   #2
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Since the black tank in our MH is 2.5' below the floor, and a Camco flushing wand is too short; I made my own from 3/4" CPVC pipe+and end cap+ a swivel adapter from 3/4" NPT to hose thread.
My sensors were exactly like yours, never read correctly. I have an outside faucet with unregulated pressure/100 psi. I flushed the already flushed tank again with my homebrew wand for about 15-20 min. and the sensors read correctly for about a month.
Now I have 3 choices, repeat process, forget about it, install new non-contact sensors. I forgot about keeping them reading correctly and just watch for the burping to begin before draining black tank.
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Old 09-17-2016, 08:52 PM   #3
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Box of denture cleaner in half tank of water, and a 30 mile drive on winding road, then dump, and add water re-do the drive , to rinse.
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Old 09-17-2016, 08:53 PM   #4
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I installed a See Level system and never looked back. Used the original wires and mounted just above the orig, so was easy peasy.
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Old 09-17-2016, 08:57 PM   #5
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we gave up that fight a long time ago after doing pretty much the same things you're doing. it felt really good to stop banging our heads on the wall. we determined two different courses of action:

- install a set of alternate/after market externally mounted tank sensors

- dump the black tank on a schedule instead of on the sensors. that's what we do. it gets dumped once a week, sometimes twice a week if others are traveling with us. it's usually just the two of us so once a week works for us. another factor governing this choice is the capacity of the black tank.
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Old 09-17-2016, 10:03 PM   #6
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Read up on the Geo Method and follow it. It might take a few times to get all the stuff out of the tank but it works. The sensors in my '02 coach work fine after all these years. No need to change to a different way to measure poop.
https://sites.google.com/site/cbruni/
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Old 09-17-2016, 10:23 PM   #7
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Waste tank level indicators .......haven't even looked at mine in years.

RV is about having fun......OCD over waste tanks ruins fun time.

Toilet 'burps' ---time to dump
Sink/shower starts draining slower -----time to dump
Water pump goes 'burrruuuuup' ------should have already added water to tank


After a few trips you get accustomed to when it's time.
Relax...have fun
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Old 09-18-2016, 12:47 AM   #8
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Quote:
Originally Posted by TROONORTH View Post
So, the level indicator for my black tank seems to have two indications; 3/4 full or full. Even if I drain the tank, the monitor still shows 3/4 full. I can look straight down the toilet and see that the bottom of the tank is not covered with . . .. .. ahem . .. . . 'water'. No matter how much of the afore mentioned water that is added changes the reading until suddenly, without prior warning and cruelly, the 'full' light on the monitor comes on and I am faced with the dilemma; 'to flush or not to flush. That is the question."

You can imagine my delight.

It would appear to a logical mind that the sensors in the black tank are corrupted ( and who could blame them). I have tried several remedies including dumping a number of bags of ice cubes down the drain and driving around, various cleansers and a load of Mr. Clean who claims to be able to 'clean everything in your house in just a minute!' But nothing seems to help.

Does anyone out there have any suggestions about a product that will do the job or a method I can try that will not require me to actually entre the tank?

Thanks in advance.
Fill out your Signature with your MH info so we can better help you. Knowing the Make, Model, and year can help a lot.
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Old 09-18-2016, 06:43 AM   #9
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Originally Posted by Civdiv99 View Post
I installed a See Level system and never looked back. Used the original wires and mounted just above the orig, so was easy peasy.
X2 Since they are mounted on the outside of the tank, nothing gets corroded or covered with "poo". Easy to install and use existing wires.
The original sensors were peeling off the side
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Old 09-18-2016, 06:54 AM   #10
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Read up on the Geo Method and follow it. It might take a few times to get all the stuff out of the tank but it works. The sensors in my '02 coach work fine after all these years. No need to change to a different way to measure poop.
https://sites.google.com/site/cbruni/
That was one of the best articles that I have read on this subject.

thank you for your post, I enjoyed reading it. makes a lot of sense..
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Old 09-18-2016, 09:04 AM   #11
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I tried all the various methods of keeping our sensors clean enough to work properly, but eventually gave that idea up as one that works better on paper than it does from a practical standpoint. Our coach is rarely stationary more than just a few days. We just empty it on occasion and make sure it's put away empty.
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Old 09-18-2016, 09:19 AM   #12
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I am somewhat concerned about what may be causing your 'burping'. Is this some new way of emptying the tank?
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Old 09-18-2016, 09:21 AM   #13
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'Denture cleaner' Thanks, I'll give it a try. May also throw in my dentures. Two birds / one stone?
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Old 09-18-2016, 09:23 AM   #14
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I've heard about 'See Level' and will reserve that as the ultimate cure. I would rather avoid having to install the system though as re-wiring and crawling around under a sewage storage tank do not rate highly on my list of things to do with a spare Sunday afternoon.
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