Slow grey water dumping?

[dbailey]

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?