Seems to me that it doesn't matter where the water comes from when dumping/cleaning the Thetford. Doesn't matter whether the water is added from the top or bottom. I have done it both ways, and using the Flush King is far superior IF the dump station has a threaded hose or you can swap the existing hose temporarily for your hose. It just fills the Thetford much faster. The Flush King is now my device of choice. I think if I was timing how long it takes to fill the Thetford tank, I would use a pressure regulator on the hose to try and get the pressure as constant as possible in various locations.
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