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Old 04-25-2012, 05:33 PM   #1
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Black Holding Tank

I purchased a 2007 coachman freelander in Texas and drove it back to my home in canada about 3500 miles. After dumping my black tank a number of time the reading would never go back to 0 but would always read 2/3 full. I had no issues with the gray water tank. Any suggestions on how to deal with this would be greatly appreciated.
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Old 04-25-2012, 05:50 PM   #2
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Those sensors get crudded up, and it is a contant battle to keep them clean enough to work. Hot water, various chemicals, lots of sloshing, may help. do some searching, many manyy threads on keeping these working.

I recently went to seelevel sensors. They use an adhesive circuit board that attaches outside the tank and works by magic. No more troubles for me, reads every 5%, always dead nuts accurate.
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Old 04-25-2012, 05:58 PM   #3
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There's a 99.9% chance that your sensors are covered with crap. (pun intended) First I would fill tank and let it soak for a few days (if you have time). Also I use the Geo Method to keep mine working. That is a combo of water softner and deturgent.

"The "Geo" method of cleaning a tank.

Dump, Add 1/2 cup Water Softener (Calgon preferred)
Add 1/2 cup dishwashing liquid (Dawn blue preferred)

Add water (I usually add about 20-30 percent of the tank capacity.

DRIVE (Sloshing the mix around well)

Dump.... again."

The Geo method portion of this post was copied from another post.
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Old 04-25-2012, 05:58 PM   #4
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Next time you drive your rv flush a bag of ice in your toilet. While you are driving around the ice will break down and scrape up any hard "substances" in your tank.
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Old 04-25-2012, 06:01 PM   #5
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Thanks for the advice I will try what you all suggested
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Old 04-25-2012, 06:55 PM   #6
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Hi and welcome to the forum!

Quote:
Originally Posted by Martino78 View Post
Next time you drive your rv flush a bag of ice in your toilet. While you are driving around the ice will break down and scrape up any hard "substances" in your tank.
This is a tried and true method I've used a number of times. Just remember to first flush you tank and then refill it with fresh water to at least about half full.

Also, if you can take the time, you might try to fill the tank with fresh water and add an enzyme cleaner designed for septic tanks. It has to sit for a week or so to be effective.

Good luck.

Rick
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Old 04-25-2012, 07:17 PM   #7
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Quote:
Originally Posted by Martino78 View Post
Next time you drive your rv flush a bag of ice in your toilet. While you are driving around the ice will break down and scrape up any hard "substances" in your tank.
This works, on a smaller scale on burnt coffee pots as well, by the way...
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