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Old 08-10-2022, 06:56 PM   #1
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Gray Tank Sensors

Hi all,

My gray tank kept showing 1/3 full. I assumed it was gunk in the holding tank. So I drove around with some warm water Dish soap. Still showing 1/3 full.

I ordered new sensors. I removed the old ones, wiped down the tank and placed new ones on. Now itís showing 2/3 full (even though tank is empty).

Curious if anyone has experience re-installing these? Iím wondering if in fact itís gunk and I need to take it on a longer trip. Or is there a trick to installing new sensors. These are the exterior sensors that stick on with 3m tape.
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Old 08-11-2022, 03:26 AM   #2
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What did the water look like when draining the gray and black tanks?

What is the coaches history - did the tank monitor ever work?

When using Dawn soap and Borax, it takes more than 1 or 2 treatments and time depending on the condition of the tanks.

That you cleaned/replaced the sensors makes me question the monitor. You might try disconnecting all sensor wires and isolate from ground. Then touch each wire to a good ground one at a time and check the monitor.
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Old 08-11-2022, 10:31 PM   #3
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What did the water look like when draining the gray and black tanks?

What is the coaches history - did the tank monitor ever work?

When using Dawn soap and Borax, it takes more than 1 or 2 treatments and time depending on the condition of the tanks.

That you cleaned/replaced the sensors makes me question the monitor. You might try disconnecting all sensor wires and isolate from ground. Then touch each wire to a good ground one at a time and check the monitor.

Yes. the monitor worked until earlier this year. Water didn’t look any different than normal. I’m suspecting the treatment wasn’t long enough. I off for a 2 hr drive this weekend. I’m going to try some dish detergent and water and see if it does the trick again.
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Old 08-12-2022, 03:45 AM   #4
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Yes. the monitor worked until earlier this year. Water didnít look any different than normal. Iím suspecting the treatment wasnít long enough. I off for a 2 hr drive this weekend. Iím going to try some dish detergent and water and see if it does the trick again.
Go to YouTube and search for the guy who does a couple of videos on how to treat your tanks using ďthe Geo methodĒ and ďpoo pyramidĒ as search terms.

Itís good your using dish detergent - but Dawn dishwashing detergent has known characteristics about how well it breaks down greases. But without knowing how hard or soft your water is, you need to add some Borax to the water.

Your drain water could be coming out clean but there could still be an electrically conductive film inside the tank.
Saying that, since youíve replaced your sensors with new ones - and assuming once replaced the tank readings were still wrong before adding anything to the tanks - that the problem is in the display (new sensors had not yet been exposed to anything conductive) or the wiring.
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Old 08-12-2022, 05:06 AM   #5
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With Grey tank empty, we poured 1 1/2 cup of Krud Kutter (available at Ace) with clean water into a 2.5 gallon jug (used an old Kitty Litter container). Then poured this 12 times into the shower drain so that we then has about 30 gallons in the grey tank. Then drove around for about an hour to slosh the inside grey tank. The sensors read OK again.

Misleading sensors are usually due to soap scum clinging on inside walls of grey tank. Some use other products which they say work also.

The manual says, while camping, one can leave the grey tank open so that it empties all the time .... don't know if that assists in letting scum dry / harden on inside tank walls, so now we will keep both tanks closed (gate valves) until they show about 1/2 to 2/3 full & then drain, also using black tank flush.

It's a pain to remove the exterior basement panel (four difficult screws & awkward handling, manual water fill opening attached) to check on the
sensors on the tanks. Usually find that it's an inside scum problem so do that first.

Some owners have also added a flush sprayer on the grey tank like they may have on the black tank.

The KrudKutter then slosh around trick worked for us. Knocking on wood.
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Old 08-12-2022, 05:51 AM   #6
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We finally broke down and did a deep cleaning of both the black and grey tanks. We got a clear elbow that connected to the drain and then connected the sewer hose to the clear fitting. I drilled a 1 inch hole in the elbow and then used a pressure washer hose with a jetter nozzle and let in draw itself in to both tanks. Easy job, maybe 20 minutes in each tank, and all problems went away and that was 3 years ago.

We also added a grey tank flush and use both flush systems monthly. Good luck getting it resolved. We full time so we like to have accurate gauges.
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Old 08-13-2022, 04:45 AM   #7
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... just a quick typo clarification to my previous post.

With Grey tank empty, we poured 1 1/2 cup of Krud Kutter (available at Ace) with clean water into a 2.5 gallon jug (used an old Kitty Litter container). Then poured this 12 times into the shower drain.....

Correction to post: by this I meant only then added clean water 12 times, NOT again each time with 1 1/2 cups of KrudKutter.
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Old 08-15-2022, 06:14 AM   #8
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What type of Krud Kutter did you use. I just search and there are many different types for different purposes
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Old 08-15-2022, 07:24 AM   #9
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Attached is photo of jug. Just again travelled 600 miles after filling grey & black tanks with a little of the stuff into about a 1/3 full clean water in tanks then dumped. Sensors work again.

Now again for a week in one location. Before leaving, will do same: dump, then add a little Krud Kutter with about 1/3 tank clean water to slosh around the inner tank walls & dump again at new location. After that will just do with normal regular travel use (no Krud Kutter) until the sensors act up again.

Good luck.
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Old 08-15-2022, 10:20 PM   #10
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Attached is photo of jug. Just again travelled 600 miles after filling grey & black tanks with a little of the stuff into about a 1/3 full clean water in tanks then dumped. Sensors work again.

Now again for a week in one location. Before leaving, will do same: dump, then add a little Krud Kutter with about 1/3 tank clean water to slosh around the inner tank walls & dump again at new location. After that will just do with normal regular travel use (no Krud Kutter) until the sensors act up again.

Good luck.
Thanks! Yes, I keep a small sprayer of it at home. Iíll get a jug and give it a try. Thank you!
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