HappyKayakers
Black River Falls WI
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Joined: 11/28/2005
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dupreet wrote:It only takes a stray piece of toilet paper to fool the sensor. Once the flow drops to a trickle, she's empty. Ignore the gauges!
Todd
Totally agree on ignoring the gauges but a slow trickle of water could also be caused by a large wad of TP stuck at the valve opening. Better to have a 5 gal bucket standing by at the dump station. When you think black tank is empty, take the bucket inside and dump it down the toilet while valve is still open.
Joe and Dakota, the wacko cat
2006 Dodge 3500 QC CTD SRW Jacobs Exhaust brake
2006 Heartland Bighorn 3600RL, MorRyde suspension, TrailAir pinbox
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Sandia Man
Rio Rancho, NM
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Joined: 08/09/2008
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Perform your dump routine unhurriedly, no matter if there is or isn't a line of RVs behind you, as they can wait their turn like you did for others dumping ahead of you. Your experience is quite common since any residual substance sticking to the sensors will cause faulty readings. As others have stated, we have a clear piece attached to the black/grey water outlet and when it's down to a trickle we're pretty much empty, plus on our rig we can look down the toilet and see the tank as well. Internal tank rinsers and flushers can help improve the reliability of tank sensor readings. Happy camping in your Aspen Trail TT!!!
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Dick_B
Palos Heights, IL USA
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Joined: 07/10/2002
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I have a No Fuss Flush system that helps assure that the tank is empty. With the clear adapter one can see if dirty or clear water is coming out when flushing. Highly recommend some sort of built-in flushing system.
Dick_B
2003 SunnyBrook 27FKS
2011 3/4 T Chevrolet Suburban
Equal-i-zer Hitch
One wife, two bikes (both Electric Schwinn's with motor assist)
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ewarnerusa
Helena, Montana
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Joined: 12/20/2011
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OP here. I do have the clear hose adapter which is how I know that the flow had slowed to a trickle. Very useful, I didn't have that on the previous TT. Next time I think I'll close the black tank valve after things slow to a trickle, go into the TT and flush a bunch of water down the toilet, then open the valve again to confirm that the water I added comes back out.
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skipnchar
Topeka or somewhere else
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Joined: 12/17/2003
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It's really just what you would think. When water stops coming out, it's empty. This can be by sound or more accurately, by sight but that's the key.
2011 F-150 HD Ecoboost 3.5 V6. 2550 payload, 17,100 GCVWR -
2004 F-150 HD (Traded after 80,000 towing miles)
2007 Rockwood 8314SS 34' travel trailer
US Govt survey shows three out of four people make up 75% of the total population
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powderman426
ohio
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Joined: 06/28/2010
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Son of Norway wrote:I don't hear so well, I put my hand gently on the underside of the sewer hose and I can feel when the liquid stops flowing.
Miles
That's what I do also. Then when I uncouple it I hold the hose below thecoupler to catch any dripping. Do the gray and rinse the hose. Done just about the time im finished with my sandwich. Lol
Ron & Charlotte
WD8CBT since 1976
28' Prowler & 05 Ram QC LB
I started with nothing and I still have most of it left
I never fail, I just succeed in finding out what doesn't work
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mr. ed
Madison, SD (but usually elsewhere)
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Joined: 02/06/2002
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FWIW, I believe I've read somewhere that sensors are available which mount on the OUTSIDE of the holding tank. That would eliminate any contamination issues. Haven't heard of them recently, though. Maybe they were a flash in the pan  .
Mr. Ed (fulltiming since 1987)
2007 Hitchhiker II LS Model 29.5 LKTG
2007 Dodge Ram 3500/6.7 CTD/QC/4X4/SB/SRW/6-speed man/Big Horn edition
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wa8yxm
Wherever I happen to park
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Joined: 07/04/2006
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When the trailer is brand spanking new the sensor shows empty.
And the odds of you ever seeing that reading again approach ZERO.
CLick Here to see how I do it
That way you can tell when it's empty, no other method is guaranteed.
This product comes in a few different configurations. (like elbows).
Nothin adds excitment like something that is none of your business
Kenwood TS-2000 housed in a 2005 Damon Intruder 377
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BB_TX
McKinney, Texas
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Joined: 04/04/2005
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My 5er has a black tank flush feature. I can hook a water hose to it and it sprays water into the black tank. I open my valve and watch until the flow is next to nothing. Then I close the valve and open the water to the flush. After letting flush water run for a minute or so, I open the black tank valve again. Invariably I see more very brown water with occasional "solids" flowing out the clear extension. I repeat the sequence 3-4 times before the water begins to run clear with no more "solids".
Without a flush system, I guess there will always be some leftovers in there.
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ewarnerusa
Helena, Montana
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Joined: 12/20/2011
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wa8yxm wrote:When the trailer is brand spanking new the sensor shows empty.
And the odds of you ever seeing that reading again approach Z
CLick Here to see how I do it
That way you can tell when it's empty, no other method is guaranteed.
This product comes in a few different configurations. (like elbows).
Thanks! Once again, I've got one of those.
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