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Old 11-07-2019, 10:28 PM   #1
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Black water tank level gauges

On my Monaco Diplomat they seem to need cleaning solution every time I empty the tank in order for them to read correctly. What are you guys using to maintain these sending units?
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Old 11-07-2019, 10:37 PM   #2
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What do you use for a tank treatment product?

When we bought our coach the tank gauges were very inaccurate. We started using Happy Campers Holding Tank Treatment and have not had a problem since.

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Old 11-07-2019, 10:40 PM   #3
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I have never had an RV that had reliable readings from the black tank. There was a completely-external product I bought once that used aluminum tape to form a pair of columns and somehow read the tank... But even that meter didn't seem to last very long.

On my current Monaco coach, when the tank is around 80% or so, the toilet "burps" a little when you open it. That's the most accurate warning I've ever gotten, b/c it doesn't do that when the tank isn't nearly full.
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Old 11-07-2019, 10:45 PM   #4
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I use Blue Dawn Premium dish soap. The large bottles are available at Costco or Home Depot.
I also use the Scott RV toilet paper from Walmart.
My tank level system works well.

If you need new tank level sensors, Northwest RV Supply has them.
http://www.nwrvsupply.com/product/16622728.html

If you need help calibrating the sensors, let me know?
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Old 11-08-2019, 04:18 PM   #5
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Do you just pour the soap down in the toilet? How much?
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Old 11-08-2019, 04:36 PM   #6
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Yes. I keep a large bottle of Blue Dawn Premium under the bathroom counter. I pour a squirt or two into the toilet each time after flushing the black tank.

You can find your tank level sensors by following the RJ11 (telephone) cord in the wet bay. The sensor screws into the bottom of the tank on one side or the other. I have not had good luck hand cleaning them. They are a pressure sensitive transducer and the membrane is easily ruptured. After installing a new sensor they must be calibrated. I like to use the empty, and then full calibration. I've tried the half tank method, but not had good results.
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Old 11-08-2019, 04:43 PM   #7
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The only time mine shows only the empty light is after I have used the black tank flush system!
I generally just go by the number of days since last dump.
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Old 11-08-2019, 07:29 PM   #8
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My grey 1/3 gets dirty first then the black (even with no solids). I use Dawn Blue Power. Tried Happy Camper. The only thing that cleans them is 1/2 Dawn and 1/2 cup of Calgon water softenerin just over 1/3 tank of water and a long drive. Very consistent over the years.
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Old 11-08-2019, 10:50 PM   #9
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Much better than the factory sensors

https://www.garnetinstruments.com/rv-shop/
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Old 11-09-2019, 10:12 AM   #10
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Quote:
Originally Posted by falconman View Post
Much better than the factory sensors

https://www.garnetinstruments.com/rv-shop/
X2 ^^^^ if you prefer not to worry again about them. Pricey though. I put them on my last coach because the previous system was inadequate. I replaced my current coach's sensors and use dish soap like Vito. I spent a little time getting them calibrated to my liking. So far so good.
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Old 11-09-2019, 10:54 AM   #11
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Forgot to mention that the SeeLevel System no longer has a wiring adapter to the Alladin System. If they had, I would have been hard pressed not to do it.
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Old 11-10-2019, 12:29 AM   #12
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Another vote for the SeeLevel 709 system, I installed one a couple of years ago, might be the best $250 I have spent on my coach.
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Old 11-10-2019, 01:12 AM   #13
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An old timer advised me to drop a bag of ice into the tank after dumping, and then drive to the next camp site, so the cubes slosh around. I have not tried it yet, as my tanks seem to read ok for the time being. I will be trying that method when they start to give me bogus readings.
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Old 11-10-2019, 10:38 AM   #14
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Most of us have tried the bag of ice and found it does not work. The best I've found is Blue Dawn Platinum dish soap with Calgon water softener and fill with water. Let sit for 24 hours, or drive, and rinse. Repeat if necessary.
I now use Blue Dawn every time I rinse the tank.
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