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Old 08-18-2013, 10:28 PM   #1
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Slow grey water dumping?

We're just back from a short weekend jaunt, and it's time for the newbie question of the week...

I find that it takes a lot longer to empty the grey water tank than I think it should. When I first open the valve, there's a big gush of water (judging just from the sound the water makes in the hose) but it quickly eases off to a slow trickle that goes on and on. I disconnected the host at one point and looked, and saw that the water was consistently draining, but slowly -- the diameter of the water stream was maybe 4 or 5mm. And it went on like this for many minutes, without slowing down.

I think the pad at the dump station was level. And I've observed this before as well, so I don't think it was just a once-off.

So when you're dumping your grey tank, how long does it take? Do you drain it until the flow stops (or at least is reduced to dripping), or do you stop before the tank is completely empty?
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Old 08-18-2013, 10:36 PM   #2
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My grey water tank is quite slow to finish draining also. I don't really worry too much about it and just enjoy the scenery till it is done.
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Old 08-18-2013, 10:48 PM   #3
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It sounds like the bottom of the grey waste tank might be quite level, instead of sloped significantly to the drain. Has anyone looked to see if this is the case?

Anyway, I wouldn't worry about draining the last bit if I didn't feel like waiting - who cares if there's a tiny bit left in the tank? There's even something to be said for not draining off the last liquid leaving bit of solid residue on the tank bottom.
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Old 08-18-2013, 10:51 PM   #4
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I found that same result and often after getting home my tank still read 1/3 full. But when I had a campsite that slanted towards the clean out and when I did empty that time, it flowed a lot more and my gauge read empty. Possible that a little tilt towards the street side may help speed and complete emptying.
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Old 08-18-2013, 11:23 PM   #5
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I usually just run the curb side wheel up on a leveler (un-leveler?) block...just takes another couple laps around the rig.
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Old 08-18-2013, 11:57 PM   #6
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I rock the trailer side to side whilst draining the last dregs of both the black and the grey tanks.
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Old 08-19-2013, 11:09 AM   #7
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Ours is slow to drain as well. After the initial surge, I'll let it drain while I'm adding chemicals to the black water tank, and at that point if I'm out of patience I shut the valve and move on. I doubt if there is a gallon left in the tank. When spending more time to flush the tanks, etc., I'll pull the right side up onto a leveling wedge. I like seeing the gray water tank reading empty when I'm finished, but that's often not the case. Not only is that last little bit slow to drain out, I think the lowest level sensor is pretty close to the bottom of the tank. So while it may read 1/3 full after dumping, I know there is really very little in the tank. I chalk it up to one of the minor quirks of the system and accept it as that.
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Old 08-19-2013, 08:21 PM   #8
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I just drained our grey water tank in our 19 for the first time yesterday and noticed it ran fast then slow for a while. I think maybe next time driving up on my first layer of 2 in levelling blocks on the passenger side to help it along.
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Old 08-19-2013, 09:49 PM   #9
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Ours seems to behave as everyone has described , I just wait a couple minutes and it always shows empty when done so that's good enough for me
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Old 08-19-2013, 09:58 PM   #10
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Queueing up at the dump station gives me anxiety at the best of times. Searching for gear, like levelling blocks,would send me baglo!
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