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Old 05-30-2016, 10:17 AM   #1
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Black Water

sorry about such a s@#$$y subject and yes, new to this.....after emptying tanks the black water tank still reads 2/3 full ???

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Old 05-30-2016, 10:36 AM   #2
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Yes, sometimes that happens with tanks that have the tank level sensors mounted inside the tank. There may still be some muck clinging around the sensors. Sometimes, after a period of time, the tank suddenly reads correctly.
If you have a black water tank flush attachment, make sure you are running water into that for a few minutes after dumping. Then dump again.

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Old 05-30-2016, 01:28 PM   #3
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Tank health is a never ending adventure.
The most common recommendation is to use lots of water and only dump the black tank after it is 2/3 full...unless you are traveling (avoid carrying the weight).

Tank treatment to avoid fouled sensors can include many things from a simple enzyme like those from Camping World or Wal*Mart to "the Geo Method." See: https://sites.google.com/site/cbruni/

Best luck
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Old 05-30-2016, 02:47 PM   #4
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There is a product that gets great reviews on Amazon for doing a through cleaning of the black tank to restore sensor functionality. It's called Tank Techs RX.
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Old 05-30-2016, 02:56 PM   #5
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I finally quit fretting over my senors. After using your rv for awhile you'll get a feel for when to empty. Mine were making me nuts trying to keep clean. Sometimes I notice they're accurate, usually not. No longer bothers me. Just sayin.
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Old 05-30-2016, 03:12 PM   #6
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Hi Neptuneslair, I installed the Camco 40126 Tornado Rotary Tank Rinser:


Tornado Permanent Tank Rinser with Remote Connection - Camco 40126 - Sewer Flushing - Camping World

I'm really satisfied with the results. You will need to drill a hole in your tank to mount it, but the process is fairly easy. You will need a 1 1/8" hole saw to drill the installation hole, as well as a 1/8" drill bit to pre-drill the holes for the mounting screws.

The rinser sprays water on the internal sensors and washes off any crud or paper that might have stuck to them.

Here's to a YouTube video that explains how it works:

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Old 07-25-2016, 10:05 AM   #7
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Easier than an installation......buy a Flush King device which is a back flush you use when dumping waste. Dump till water runs clear then you know tanks are empty & clean.
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Old 07-25-2016, 02:35 PM   #8
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a simple fix is put left over ice in the toilet after camping. when you drive it cleans anything stuck to you holding tank walls.
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Old 07-26-2016, 07:26 PM   #9
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Agree with the ice. I add a few inches of water, 1/2 bag of ice then drive home. Usually it empties and show clear sensors.

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Old 08-03-2016, 10:47 PM   #10
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I've always approached this a little differently and over the years its worked for us... we charge the black water tank with 3-4 full toilets of water when we're done dumping the tank... we than add back either a cup of laundry soap (powder) or 1/2 cup liquid or (1) cup oxyclean... as we run down the road the water gets hot.. and the soap and water washes out the tank....

On the last day out... we do the same and dump the tank if it needs it or not.... and at the last dump site on the way to the house... we do it again... its a surprise how dirty the liquid is...

BTW we have a clear elbow attached to our hose... and when possible we run the tank spray until the water runs clear....

This works for us.... BTW... the tank sensor works maybe 20% of the time...
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Old 08-03-2016, 11:08 PM   #11
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Yes, the clear elbow was one of my best purchases!
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Old 08-05-2016, 03:32 PM   #12
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The Geo Method has worked for me but its a bit of a hassle for what its worth. I have pretty much given up on my sensors. I agree with Wapa1, after a while you learn when you need to dump.
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Old 08-05-2016, 03:40 PM   #13
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Mine did the same. I used the holding tank cleaners, etc. and did a lot of flushing out. Now it reads accurately. No more "Klingons".
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Old 08-05-2016, 04:15 PM   #14
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I don't bother checking the black sensor. I know I have to dump when I can see the liquid level down thru the toilet opening when I flush.

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