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Holding tank sensor maintenance

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I’m sure at some point you’ve emptied your tanks only to find that your sensors are reading full. RVs require maintenance, and this includes your holding tanks, too! Over time, holding tank sensor probes build up with sludge/scum and this is what causes incorrect readings.

I want to introduce you to Thetford’s Level Gauge Cleaner. It is specially formulated to dissolve tissue, waste, sludge and soap scum buildup. The 100 percent biodegradable liquid works with both black and gray water tanks on all RVs. The Level Gauge Cleaner prevents buildups and restores level sensor operation fast.

Here are some additional highlights of Thetford’s Level Gauge Cleaner:

VERSATILITY: Thetford’s Level Gauge Cleaner is designed to work with all RVs.

FUNCTIONALITY: Dissolves tissue sludge and soap scum buildups, restoring level sensor operation fast.

UTILITY: Prevents buildups on probes and tanks when used regularly.

CONVENIENCE: Formulated to work with gray and black water tanks.

SAFETY: Level Gauge Cleaner is 100% biodegradable.

More from Dustin

Read more of Dustin’s articles here.

Dustin owns and operates California RV Specialists, an independent RV repair shop located in Lodi, CA. He thrives on sharing his knowledge and enthusiasm of RV repair and maintenance with his team, customers, and virtual friends.

Be sure to check out his YouTube channel where he shares what’s going on in the shop and the product offerings in the store. Dustin is also very active on Facebook. Join his group, RV Repairs and Tips – What’s in the shop!

Dustin proudly operates the business alongside his wife, Ashley; but the true pair that run the show are their Boston Terriers, Arvie and Hitch.

##RVDT1997

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22 Comments
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SDW
16 days ago

Better still, just get Sea level gauges. They go on the outside of the tanks and never corrode. They also read tank level in %.
Not 1/3, 2/3,full.
If you have this type of gauge, it can read at two thirds and the next time you flush the commode it reads full because the level is just below the the full mark so it still reads 2/3.
Sea level gauges read 5%,10%,15% up to a 100%.

captain gort
12 days ago
Reply to  SDW

Too bad that they block access to many tanks now with those “belly wrap” coverings. Now, you can’t inspect anything.

Gary Stone
17 days ago

I found this video to be very helpful re tank sensors: https://youtu.be/v9yAIC4M36U

Gary
17 days ago
Reply to  Gary Stone

Talk about over explaining everything. 29 minutes and all I really learned was you need 5 different multimeters to test your sensors. That could have been a 15 minute video.

Gary Stone
17 days ago
Reply to  Gary

Lol…complain to the vlogger, not me.

Gary
17 days ago
Reply to  Gary Stone

I wasn’t complaining to you, just commenting.

SDW
16 days ago
Reply to  Gary Stone

Better still, just get Sea level gauges. They go on the outside of the tanks and never corrode. They also read tank level in %.
Not 1/3, 2/3,full.
If you have this type of gauge, it can read at two thirds and the next time you flush the commode it reads full because the level is just below the the full mark so it still reads 2/3.
Sea level gauges read 5%,10%,15% up to a 100%

SDW
16 days ago
Reply to  Gary Stone

Better still, just get Sea level gauges. They go on the outside of the tanks and never corrode. They also read tank level in %.
Not 1/3, 2/3,full.
If you have this type of gauge, it can read at two thirds and the next time you flush the commode it reads full because the level is just below the the full mark so it still reads 2/3.
Sea level gauges read 5%,10%,15% up to a 100%

Thomas D
17 days ago

Manufacturers only spend what they have to. Buy the cheapest! It’ll be good enough. After a couple years I gave up and installed Sea Level. Works just fine. Consistently reads the same. To clean the tanks i used Rid x septic tank treatment. Cheap and 100% biodegradable. Unfortunately to install you must get under the camper and remove the black corelax which ain’t easy.Wouldn’t it be nice if O EM
Had not been so cheap. Probably saved $10 ( whjch the customer would pay for , one way or another)

DW/ND
17 days ago
Reply to  Thomas D

I use Rid-X also – and have for some years. I just add it directly into the toilet and the kitchen sink drain.

Jeff A
17 days ago

This article needs to be the laugh of the day

Snoopy
17 days ago

I’m sure that there are many ways to clean them there sensors! It would be in the best interest of RV manufactures to spend a few bucks more & put the sensors on the outside of the tank. Most RV’s if not all of them have that issue with false readings. Actually its very concerning to go from empty to 3/4 full in one day of boondocking! Been there done that. I was thinking of swapping out to the exterior sensors, but Forest River has hidden them behind my water distribution center & very hard to get to. Those inside sensors are so useless, last time out our empty tank showed 1/2 full after dumping & rinsing. When got home & dumped & rinsed the dang black tank sensor read empty, didn’t use anything other that our usual Happy Camper, go figure!
Happy Thanksgiving to all!!!!
Snoopy

Joe
17 days ago

Someone is always selling the better snake oil! I started using Rid-X 25+ years ago. After every dump I put a tablespoon in each tank, on travel days we use Dawn dish detergent and Borax in each tank with several gallons of water to slosh around, very seldom do we have a problem and if we did it is usually gone by the next dump. No need to buy expensive chemicals, Rid-X is good for the septic systems as that is what I use in our home septic system 4 times a year and it has worked flawlessly for 43 years without issues. As a note avoid using anything with liquid Clorox or other sanitizers to clean the toilets (we use an acidic cleaner in the China bowls followed by a sanitizer wipe), use a screen in the kitchen sink to collect food scraps.

Joe Allen
17 days ago

Take one scoop of Happy Camper and put it down your grey tank and sensors will be working great. Also, 12 ounces of Pinesol and 2 ounces of Calgon work with black tank. Put in after you dump. Been doing this now for 8 months and we are full time. Throw those others out as they are destroying septic tanks with their chemicals!

R Beck
17 days ago
Reply to  Joe Allen

What type of Calgon do you use as there is a couple different items of Calgon?
Thanks

Gary Stone
17 days ago
Reply to  R Beck

I use Calgon water softener.

John S
17 days ago
Reply to  R Beck

Liquid version – often available @ Walmart.

SDW
16 days ago
Reply to  Joe Allen

Better still, just get Sea level gauges. They go on the outside of the tanks and never corrode. They also read tank level in %.
Not 1/3, 2/3,full.
If you have this type of gauge, it can read at two thirds and the next time you flush the commode it reads full because the level is just below the the full mark so it still reads 2/3.
Sea level gauges read 5%,10%,15% up to a 100%

Carl
17 days ago

Dishwasher detergent also works

Leonard
17 days ago
Reply to  Carl

Yup, I only use Dawn purchased from Costco. The sensors will fail even after you clean the black tank thoroughly.
When I was a newbie, I tried and used all the crap (pardon the pun!) that was to be used. Just overpriced and no better than good old Dawn.

SDW
16 days ago
Reply to  Leonard

Better still, just get Sea level gauges. They go on the outside of the tanks and never corrode. They also read tank level in %.
Not 1/3, 2/3,full.
If you have this type of gauge, it can read at two thirds and the next time you flush the commode it reads full because the level is just below the the full mark so it still reads 2/3.
Sea level gauges read 5%,10%,15% up to a 100%

John S
17 days ago

This is just one of many such products available and doesn’t have the best of reviews. Then again, some of the options available are no better/worse. I use the GEO Method regularly to keep the holding tanks AND the sensors working well.