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Old 06-17-2014, 12:05 PM   #1
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black/gray tank sensors

I had my tanks pumped out by johhny on the spot since the RV can't be moved (semi permanent location). After the pumpout, the tanks are still reading
3/4-full. How do I get them to reset to empty, or are they "crapped" up with tp?
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Old 06-17-2014, 12:09 PM   #2
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I'd say that's a good bet, did you or they hose anything down the tanks to keep some fresh water flowing to try and get everything loose? It might have helped a little but, regardless regular cleaning of the tank is something good to do.

I don't keep my trailer anywhere permanently, so it's easier where I can mix a solution up and let it slosh around on the way to the campground. For the permanent or semi-permanent it's a tougher thing to do.

If you do move the trailer home at the end of the season, it might be a good idea to start a cleaning routine of the tanks prior to doing that. By cleaning, I mean a rinse and use of chemicals to help clean the tank too.

Sounds like it's just as you suspected though.
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Old 06-17-2014, 12:13 PM   #3
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Your second query is the correct one. You cannot reset to empty. My solution is to do several tank flushes and then you will have clean tanks and sensors. Others have used ice cubes, changed the sensors to a different brand and other cleaning methods.
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Old 06-17-2014, 12:18 PM   #4
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I wasn't available when they did the pump out, so they did it without me. How am I to know what the true levels are going forward, since I do not have the ability to flush system with fresh water repeatedly to dislodge any ugliness? The only idea I have is to just have them come monthly while we are using the rv just to be on the safe side.
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Old 06-17-2014, 12:44 PM   #5
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If you have a garden hose at your site try spraying water in your toilet with the flapper open.
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Old 06-17-2014, 01:02 PM   #6
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Use one of these to clean and flush wall of black tank when they come to empty.....

Flexible Tank Wand - Valterra A01-0187VP - Sewer Flushing - Camping World
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Old 06-18-2014, 08:35 AM   #7
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Static campers have the worst problems with sensors because without the agitation of movement, keeping the walls and floor of the tank clean is a challenge.

You must install turboflushers (ESPECIALLY) if you use a pump out service. The service only sucks out the liquid from the tank and can easily leave solids behind. Eventually you will need a clean-out service (NOT a pump out service - very expensive) or a tank replacement (even more expensive).

So, you need to treat your holding tanks like a septic tank more than a holding tank. Septic tanks use bacteria and enzymes to "digest" the solids in your tank and turn it into a liquid that will flush out.

Use a bacterial treatment like RV-Digest-It by Unique RV Digest-It Holding Tank Treatment or Rid-X RID-X® Tank Septic System Treatment Products for Septic Maintenance - Official Site to maintain your tanks. You will need to allow the stuff to work for 72 hours to eat the scum off your walls (causing your bad readings - NOT TP!) and to soften your "Tower of Doom" under the toilet drop pipe.

Worst case you will need to replace the OEM "button" probes with Horst probes to eliminate false readings.





Horst Mircacle Probes - Get accurate reading on your RV's holding tanks

My install here: Horst tank Probe Installation

If you go this route, I suggest BLACK tank probes in BOTH the black and gray tanks. I had issues with long hair from the shower fouling the spiral coil on the gray tank probes.
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Old 06-27-2014, 11:06 AM   #8
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Herk - after reading several of your posts about RV Digest-It by Unique, I ordered some in and - "HOLY CRAP" amazed at what came out!!! Black tank is now showing empty! Question - do you use this on your grey tank as well? Just dumped the grey tank and panel is showing "1/3" while black is now on "E". Thanks for the great advice!
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Old 06-27-2014, 03:07 PM   #9
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I do. Works just as well on soap and oils
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Old 06-27-2014, 05:43 PM   #10
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If you want bugs that eat.....a gallon of old milk that is going bad and a pack or two of yeast.......depending on size of tank.....fill the tank as full as possible and give it time to work some.....along with a ride down the road if possible....let it sit awhile
the stuff has to hatch out and eat so longer is better plus with tank being close to full should help soften some of the problems......when you have a full hookup flush it out several times and then if things are working, use a cap full of cheap laundry detergent and a cap full of water softener.....to keep tank sides slick and clean......if you have used chemicals in the tank the sensors may be eaten up ......good luck.....
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