Does a gravity fed overflow box use a siphon? I had thought about that but wasn't sure if it was a long term solution. If people use it for aquariums then it must work. I'm thinking something like this (sorry for the bad drawing):
How could I keep the tube in place at the bottom of the mini pond?
One potential problem with the setup in the drawing is that the bottom of the hole under the liner will fill with water since it's a spring. Or would the weight of the water on top of the liner push that water somewhere else?
