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Old 01-05-2016, 06:33 AM   #1
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Gray and black tanks do not completely empty

We had to using the dumping station at the state park we stayed at last week. After going through the process to empty our tanks they still registered as 1/3 full. Any ideas on what we may have missed? We never had this issued with our bumper pull so not sure if we need to do something different.
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Old 01-05-2016, 06:39 AM   #2
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Could just be bad guages. Sometimes residual moisture will also give a false reading.
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Old 01-05-2016, 07:30 AM   #3
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This has been a common issue for me when using a dump station and not having the ability to rinse the tanks good. Something is most likely hung up on a sensor inside the tank to give you a false reading. Before leaving for your next trip put 5 to 10 gallons of water in each tank. Then as you travel this water will slosh around in your tank and hopefully clean your sensors off. When you get to your next destination and hopefully have a sewer connection dump your tanks again and check your gauge.
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Old 01-05-2016, 07:30 AM   #4
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It's possible you have debris on one of the sensors causing a bad reading. It happens a lot. A good solution is to get one of those "wands" you stick in the tank that cleans the walls and sensors. Your tanks are most likely empty, especially if you remove the cap and nothing flows out. Make sure the gates are opening and you don't have a faulty waste valve. Other than that, probably debris.
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Old 01-05-2016, 07:48 AM   #5
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Quote:
Originally Posted by RobinA View Post
We had to using the dumping station at the state park we stayed at last week. After going through the process to empty our tanks they still registered as 1/3 full. Any ideas on what we may have missed? We never had this issued with our bumper pull so not sure if we need to do something different.
We had a bit of a challenge with our 'old' TT, a SLX 165RB, where the black sensor always read "full", so I finally got one of those wands for flushing out the tank. Worked great. Must have been some debris on the sensor. Luckily our new Jay Feather 23RLSW has a black water flush system.
On the grey water issue, I noticed in the 165RB that it would go from empty to 1/3 really fast. Didn't worry too much about it, as long as I was confident that I was getting it drained as much as possible. Is a dump station that much different from a regular hookup? I wouldn't think so, unless you want to get it done in a hurry and don't wait for it to completely drain. No experience.

Roger
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Old 01-05-2016, 07:55 AM   #6
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Is a dump station that much different from a regular hookup? I wouldn't think so, unless you want to get it done in a hurry and don't wait for it to completely drain. No experience.

Roger
Usually the issue and difference using a dump station vs. a site with a sewer hook up is the time needed and the availability of fresh water for rinsing. My experience with using a dump station is you may have others waiting in line so you don't have the time even if you had water on board to rinse. The other is most don't have a hose connection for fresh water because of the contamination possibility.
I don't worry about it during the season, using a dump station but I make sure at the end of the season on my last trip, that I have a sewer connection so I can fill and dump tanks several times before storing for the winter.
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Old 01-05-2016, 08:00 AM   #7
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One other point that I'm sure has been mentioned many times is to purchase a clear 45 degree sewer connector and use it right on the connection to the dump outlet and then attach your sewer line to it. With this clear piece you can then see when your tanks are clean. I always run water and flush until everything runs clear. By doing this I have never had a stinky TT.
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Old 01-05-2016, 09:05 AM   #8
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x2 all of the things said previously regarding the black tank:
- I have a clear connector
- use the built-in black tank flush
- flush until the water runs clear
- add water into to black tank after flushing.
(BTW, adding water is important to not build a 'tower of poo' at the bottom of the tank.)

I must have debris stuck on a sensor because it always shows 1/3 full even when it is totally empty. I never used any chemicals (never had an odor problem), but next season I will use chemicals (before the 'wand') to see if I can get that sensor clean.
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Old 01-05-2016, 11:56 AM   #9
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You may want to also consider testing a few brands of toilet paper as well. From our experience, cheaper brand of paper did not dissolve/breakdown very well in the tank. Thus, it gets clumpy and then creates havoc by covering the tank sensor. We found that the Scott's brand has been the best so far for us. It dissolved very well and we haven't encountered any tank sensor issue yet. The use of the black tank rinse connection is also key to a cleaner tank.

Happy camping!

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We had to using the dumping station at the state park we stayed at last week. After going through the process to empty our tanks they still registered as 1/3 full. Any ideas on what we may have missed? We never had this issued with our bumper pull so not sure if we need to do something different.
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Old 01-05-2016, 01:05 PM   #10
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Thanks for all the info everyone!!
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